Product review (3 stars): Mediocre app and limited history make it disappointing for me
Mixed feelings on this.  Mostly based on poor software (ie, they should be able to fix it).

I bought this to monitor internal temperature and humidity to deal with some issues inside the house.  So I wanted to be able to monitor and compare multiple sensors, and see how different sensors compare over time.

The good:
- Easy to set up
- Easy to add additional sensors
- You can export the data.  Although only up to 31 days.

The bad:
- The app is clunky.  Not easy to navigate, only lets you see one sensor at a time.
- Only 31 days of data available.  Really?  There are options in the app to show a year and lifetime data, but they just show a blank screen and a message that 31 days is the max.  This kind of data shouldn't require much storage, seems like 6 or better 12 months would be a more reasonable minimum.
- Frequent disconnects.  My house isn't huge, but I frequently have various monitors drop in and out.  Have played a little with where I put the hub, but since the hub is wired only I don't have that many options.  That said, it is pretty much in the middle of all the sensors, so it is in a pretty good place.  But still I have problems with some of the sensors dropping offline.
- I've seen other reviews that say their phone support is good.  However, I prefer email support, which they don't have.

All in all, I wouldn't recommend, and probably wouldn't buy again.  If they stored the data for more than 31 days, and put some more effort into their app, I'd probably raise it to 4 stars, since then I could overcome the issues by downloading the data.  Having to download every month though is a pain.