Product review (2 stars): Documentation needs work and unit requires manual intervention after power outage
FIRST REVISION

I have had the unit for a few weeks and went through our first power outage which revealed an major flaw: POWER OUTAGES REQUIRE MANUAL INTERVENTION.

I have now had the device for a few weeks and went through our first power outage. When the power came back on the unit came up with the right hand blue light flashing. The only cure is to power the unit off, press the reset button on the bottom (I held it for a few seconds seconds), and then re-apply the power. We want the unit to monitor our home while we travel over the winter. I am going to put it on a UPS system and hope that the unit will stay powered up.

a) SETUP:
  1: you have to enable at least one sensor to get the hub recognized by the web application. Literally spent hours waiting for the lights to stop blinking. After searching on the web a user stated that the you had to install batteries in a sensor before the web site application will recognize your hub. The installation sheet does not tell you that. It said that the lights would stop blinking and then you could complete the setup. After six hours of a blinking light, I installed batteries in one sensor and seconds later the lights on the hub went solid and the web application allowed me to setup the system and add the other two sensors.
  2: sensors have to be upright or range is significantly reduced. When I was trouble shooting a bad sensor (see below) I set the second sensor horizontal and got no connectivity.
b) SENSORS:
  1: as other users have stated, the sensors are not very well calibrated. This is not a fifty cent sensor, they should read +/- 1 degree IMO.
  2: one sensor that read 70 degrees inside went to -40 degrees when I put it outside when it was appox 50 degrees. brought sensor back inside and  it returned to 70 degrees. I will test it again tonight. If it is bad I will have to find out if the vendor will want to send a replacement sensor or if I have to return the whole unit.

Assuming that I get a good sensor I would recommend this unit since it seems to work, I can add sensors and can even buy a range extender so I can monitor my barn.