I bought this item with the understanding it had flaws. It is a new line, and it is a big step to take. Almost like moving from Windows 98 to Windows XP. It takes a lot of getting used to, and it is cumbersome to set up. I spent over 3 hours backing up the maps that come on the unit (not viewable on the PC, but do back it up because if lost they are not recoverable), customizing the "profiles," and rearranging the shortcuts to an actual usable rotation.
The unit runs off of shortcuts, rather than buttons on the front of the unit (like to 60C series). One button pulls up a menu of options to scroll through. You can change profiles to bring up different sets of shortcuts and settings.
I.e. I start in Automotive, which has a map viewed form above, with on-road auto-nav to a location near a geocache. Once I find a parking spot, I press the shortcuts button, and change to "geocaching" profile. It automatically switches to 3d topographical, "off-road" map that I follow to the cache. When I get close I shortcut to the option of compass o get right to it.
I have not had the bad experience of draining batteries. I accidentally left it on the first night after using it, and even after caching with the backlight periodically on, it still had bars left on the gauge the next morning.
Accuracy is not an issue (it is quite phenominal, 7-10ft 90% of the time) and I get full strength GPS signal inside the middle of my house (never ever got that with my 60CS).
The basemap roads are off significantly, but since I purchased the city-nav software with the unit, I only had to deal with the basemap for the ride home from where I bought it :). 80ft accuracy on the topography mapping is not so hot when driving (which side of the knoll am I on?), but when hiking it is more than accurate enough with the path tracking turned on (if 80ft off gets you lost while hiking, you probably shouldn't be hiking off the path).
The geocaching options are fabulous, being able to view the full name, description, previous logs, and an option to view the hint is great.
My only complaints are that geocaches don't show on the maps (only waypoints do). You can't edit/delete/mark-as-found geocaches at all. The marketing for this unit is a complete lie when they say "bright display even in the sunlight". Truth be told, on a sunny day like today, even in the shade, with the backlight fully on, it is hard to see the details on the screen. Also, only certain mini-usb chargers will charge the unit. The one I use to charge my cell phone puts the unit into "computer linking" mode rather than as a power supply (rendering it unusable as a GPS). Other phone charges work fine for some reason, there must be a difference between Type-A mini USB and Type-B mini USB that the unit is sensitive too, while most cell phones and the like are not.
Overall with the 400t, city nav 2008, the dash mount (60cs version doesn't fit), new car charger and protective case, it came to a ridiculously high cost, but understand this: I would buy it again. If you do so, just remember that the effort you put into setting it up to fit your needs makes a huge difference. Take the time to learn it inside and out and you will experience how the complexity of it turns into versatility and enjoyment.