Product review (5 stars): Works great out of the box
I read all the warnings in the review section here, but purchased this anyways.  I couldn't find anything else comparable for the money, this provides exactly what I need:  a remote IP thermometer that I can check anywhere in the world.

Yes, the included instructions are minimal.  But there isn't much to it, it's very simple.  Go to their website, click activate, and the online instructions will walk you effortlessly through the setup.  I plugged the base unit (called a Gateway) into my router, went to their website, clicked activate, entered the code that was provided in the box, clicked "connect" on the base unit, and it registered itself.  Simple.  Then I followed the instructions, put the batteries in the sensor (thermometer) clicked "connect" on the sensor, then on the base unit, and it connected.  (Actually, I had to press connect twice, but the website mentioned that this could happen, no problem).  I purchased an additional sensor, and it set up just as easy.  Then on the website, following the instructions, I registered the sensors.  The sensor serial numbers were already transmitted to the website by the base unit, so following the instructions, I gave each sensor a name ("loft" and "basement") and that was it.  The website now has my personal page and there are two tabs to choose from:  loft and basement.  Click each tab and it shows the curent temp and humidity.  It also has a graphic chart with daily or monthly graduations to see the history of the temperature readings.

Very simple setup and activation right out of the box.  I will update this review if things go sour.  If you don't see an update, then everything is working properly.