It just arrived yesterday; I thought I would share my initial impressions, while they remain fresh in my mind. I'll try to remember to update this later if anything changes.
My bottom line -- I recommend it, and would purchase it again. It does just what I want, does it well, and has a fairly simple screen with nice big digits -- nice and readable. I am happy with my choice.
Consistency -- Very good. I had the base and remote units side-by-side on my desk for awhile to see whether they at least showed the same temperature, and they did -- sometimes identical, and never off by more than 0.2 degrees. That could well be round-off error and/or minor air current differences. (Reviews for some other brands/models are not that good.)
Accuracy -- I don't have another thermometer to compare against. I can say that the outdoor reading stays within a degree or three of what my computer reports the airport (several miles away) was reporting. The difference appears to just be the airport report lagging. Until proven otherwise, I am satisfied with the accuracy.
[edit (7/5/11) update: I have been constantly comparing it against the thermometer from my Honeywell thermostat for the last week and a half, and they match quite well. This one lags less than the one on the thermostat.]
Precision -- 0.1 degree -- mainly useful to show trends more easily than full degrees would -- nice for that.
Functions -- Good. All work as advertised. All the functions that I need.
Remote sensor -- has a small base, so it can sit upright on a flat surface. Seems like the wind might blow it over, but we shall see. Worst case is I might have to either lay it down, or else wall-mount it. Back attaches with four small Phillips head screws -- I presume that is for the weatherproofing -- less convenient, but won't matter as long as battery life is good.
Batteries -- the product manual advises against rechargeable batteries "Avoid using rechargeable batteries. (Rechargeable batteries cannot maintain correct power requirements.)" Since all I have are rechargeable batteries, I'm using them and they work fine so far.
I note that in the "Battery Safety Information" section they refer to "rechargeable (Nickel Cadmium)" batteries. My hope is that their caution only applies to conventional rechargeable batteries, especially NiCad (since those lose charge even sitting, and might not remain charged enough over time in the thermometer). I am using LSD batteries (Sony Cycle Energy, Sanyo Eneloop, Imedion, etc), and expect that their low self discharge means they will last just fine in the thermometer. I am using the Sony's, but any of the major brands should do as well.
[edit (7/5/11) update: it has operated flawlessly on the rechargeable batteries so far -- I'd say go for it. Only time will tell how long they last.]
The following are very very minor points, and do not detract from the 5-star rating:
*) Comfort level indicator -- Works as advertised. No problem, but I could do without it. For me, it is just visual clutter.
*) Trend indicator -- I have no idea what they are talking about. It is in the on-line description, but I cannot find it in the manual and I have seen nothing on the screen that corresponds.
*) Extraneous -- The little thermometer (upper left) and water drops (I presume, lower left) serve no function that I can see. I have not found them in the manual. They have not changed so far. I don't need them as labels -- the degree and percent signs are enough -- so they are just (minor) visual clutter.