I wanted to purchase timers for our basement, bedroom, and RV dehumidifiers. My wife really dislikes the noise from the dehumidifiers, so I wanted to automatically switch them off at times during the day/night when she would typically be in the given room. And I wanted our RV's dehumidifier to run only a few times in a 24 hour period to cut down on moisture without running constantly.
In general, the mechanical timers (a little motorize clock mechanism turns a disk with switches) seem to have a number of pros and cons.
Mechanical timer pros: Inexpensive, VERY easy to set/change program, VERY easy to see the program at a glance, multiple on/off times. The program is easy to see because on/off pins are depressed on a rotating disk that represents 24 hours.
Mechanical timer cons: Inaccurate time keeping and timing, can break or wear out (especially given most are of poor quality), can be noisy (the motorized mechanism), switch pins can get lost, incapable of handling weekday/weekend programs.
So then I looked at the electronic timers. They also have pros and cons.
Electronic timer pros: Accurate timing, no moving parts so won't wear out easily (assuming they are designed and manufactured properly with parts of reasonable quality), silent, no pins to get lost, more flexible timing capability, random on/off capability.
Electronic timer cons: More expensive, can be harder to program, and, most important, you can't view the on/off program at a glance and must, instead, step through all the on/off times.
Based on these pros and cons, I decided that I wanted a digital timer. But which one?
These Leviton timers have something that other digital timers do not have... The LCD display includes a circle that represents 24 hours. When you program it, you can see ALL of the day's on/off times in this circle, as on times are shown with a chain of highlighted blocks around the circle. So, with one glance, you can see when the timer will be on and when it will be off in the given 24 hour period. Very nice. Suddenly one of the most important benefits of mechanical timers is available in a digital timer.
I couldn't find any reviews for these timers, so I purchased them based on the key feature noted above. Now that I have used them for a few days, here is my impression of the timer:
1. The timer appear to be solid/rugged and has a 5 year warranty. The plastic doesn't feel cheap. I have other Leviton switches in my home, and I trust the name.
2. The outlet is grounded (three holes) so any grounded or ungrounded appliance will plug into it.
3. The timer isn't very large. I've got one outlet that is located right beside a bookshelf, and this timer was small enough that it could plug into it without be obstructed by the bookshelf.
4. It has a battery backup. I find this is useful during programming, as I unplugged the timer from the wall and programmed it under a reading light so I could better see the display.
5. The timer has both standard and pro programming modes. You select the desired mode when you first power up the timer. The standard mode user interface is simpler and has 3 on/off programs per day. The pro mode user interface is more powerful and has 50 on/off events per day. Events in both modes can be programmer for days, weekdays, or weekends.
6. When I ordered the timer, I didn't know that it includes a sunrise/sunset on/off mode based on your time zone and unique longitude and latitude (in pro mode). Just enter in your approximate location on the earth and any number of your programs can include on/off switching precisely at sunrise or sunset - or at a user-defined offset to sunrise or sunset. Very cool.
7. The clock adjusts automatically to daylight savings time.
8. The timer includes an override button to manually turn the appliance on/off.
9. The timer has a big override button on it. If you press it, it will toggle the switch and keep it in that state until the next scheduled event. This is very useful. For example, if we are in the basement and find the dehumidifier to be too loud, we can press this button to turn it off early. But the timer will still turn it back on at the next scheduled on time. There's no need to remember to turn it back on. Nice. In addition, if you press and hold the override, it will keep the switch in an on or off state permanently.
10. The user interface is pretty intuitive and quick to learn and use. This is really important to me. You know a user interface is well designed when you don't need to refer to the instruction manual repeatedly and you don't mumble a few swear words while learning the interface. After about 1 minute of programming this timer, it was clear to me how the user interface worked. And, as described above, being able to see the on/off times represented in the 24 hour disk in the display is very handy.
One extra comment about why this user interface is nice... Years ago I had digital wall timers in my old home that forced you to step through EVERY on/off time during programming and review. It was so frustrating. If, for example, you wanted to change the "on time" from 8 pm to 8:20 pm, you'd be forced to repeatedly press the "Next" button until you found the 8 pm time as all on/off times were arranged in a chain. But with this Leviton timer, each on/off program is distinct. So, for example, I can scroll down to "Event 7" and change it from 8 pm to 8:20 pm WITHOUT first having to step through all the other events. And you can easily change the time by using the up and down buttons.
Conclusion:
I'm very happy with this timer. I'll be back to report problems, if I come across any. It seems like a quality product with plenty of features and an easy to use interface. I've got all three of mine reliably running unique weekday and weekend on/off times for our dehumidifiers.
ADDED NOVEMBER, 2011. I still love this timer but I agree it has a serious battery problem. This is not an issue as long as the timer is plugged in but, if I unplug it, the time is lost (although the various on/off settings are preserved). This means that, in the event of a power outage, I have to go reset all the times. Fortunately, we have very few outages where I live so this has been only a minor issue.