Product review (5 stars): Happy!
Well, it's a bit early to review but I'll come back and change it if necessary.
I am thrilled so far. My previous indoor-outdoor "weather stations" was a royal pain to set up, or to reset when it went wonky or needed new batteries. You had to put the batteries into each of the two units in a precise order, with units 3-5 feet apart, and wait for them to synch--then repeat. And repeat. I ordered a different kind when that one broke, and sent it back immediately because it would not switch from Celsius to Fahrenheit. Plus, the outdoor unit required messing with practically-microscopic screws in order to put batteries in, test, open and fiddle, try again--maddening! And if one of those tiny screws pops out and ends up on the floor--good luck finding it.

This one? Could not be easier. Snap off the back panels (no screws!), put in batteries, off ya go.  And the outdoor unit is designed so you can hang it from a string if you want (which will enable more accurate temp reading than attaching it to a wall with screws or laying flat on a surface).
Very basic, so it doesn't record previous highs and lows or other things, but then those were unreliable and hard to get to on my old unit anyway.