I said 'flawless' but there are a couple things I'll mention.
The display is very complete and has all the info, but it's off axis viewing isn't great. If you're looking at it dead on it's great, but it dims fast off axis. Not an expensive panel, is my guess. For another $100 they'll sell you one with a bigger, brighter panel (same outdoor unit) but I've never felt like I made a mistake. I've got mine tied into the 'net, and their (free) phone app is just too cool. Plenty of info, anywhere I want to look at it. I use the phone app almost all the time, and it's fantastic. Mine talks to the AW site and I also report to Weather Underground. I get access to both apps, for free, and have never felt like I needed more. WU has a great forecast panel which I like.
Also, it's been known to rain pretty heavily here in the PacNW and after a couple of days of heavy rain, the RH sensor seems to get saturated and will read 100% until it dries out a bit.
Mine's about four years old, batteries seem to last for years. I used good Ever Ready Lithium cells, worth every penny. As George mentioned, there are solar cells on the top of the outdoor unit that seem to do a fine job.
I set up mine on the patio temporarily so I could get to it at first. Got all the software singing happily and let it run for a week or so, just to be sure before my son helped me put it up on the end of the house.
Sure, there are 'better' units, but my research showed me you're into the $600 range pretty fast and they don't really do lots more. I'd buy my same system again, no hesitation. This one replaced an Accurite, it's much better, IMHO.
Sure like ours, hope this helps..!!