Product review (4 stars): Early Days But So Far, So Good
Early days, but it appears to be accurate enough to prove useful. (I am comparing the outside temp and humidity to local weather stations in my area on Wundermap, my absolute favorite weather app.)  I will say that placement is paramount and it wasn't until I found a spot on the northern end of my deck (protected from sun and most direct weather) that the readings began falling into line with the other local Wundermap listings.

I initially thought I'd return the unit due to its skewed readings compared to other local and indoor temp/humidity readings but after a few hours I was satisfied that they were pretty accurate overall.  (Point being that you should give it at least overnight before making any decision to return.)

For the price it seems a pretty decent device and it actually has a nice look and useful display.