I have been allowed to play with a sensorist set. http://sensorist.com/
The kit is extremely easy to set up. There is an A5 page with 7 points in the package, and that's actually what it takes before it's all set up. The guide is also available at http://sensorist.com/setup
The system is a master with temperature/humidity sensors. To each sensor you can add a probe, so you get an additional temperature measurement point.
The system is cloud based. Not exactly what I prefer, but I can see how that makes it extremely easy to handle.
There is also an API under development. That makes it possible to connect the system to HomeSeer or the like. A couple of us at zwaves.dk made a quick and dirty way to get data into Homeseer 2. The scripts can be found at http://www.zwaves.dk/forum/viewtopic.php?f=21&t=1637 (Danish). I think we have a chance to influence it if there is anything we know much better than them.

There is no local display, so you're relying on a browser or iOS device to read a device. With the push of a button on a sensor you can get an email or notification on IOS with the current reading.
You can set up alerts, so you get mail or notification when they are exceeded.
There's App for IOS. The latest version requires iOS 7. Android app is coming.
The system is 868 MHz but not Z-Wave. There doesn't seem to be any problems in my 868MHz hell. I have quite a few 868 MHz systems running. All with the master within a few meters.
There is actually not much to write. It was easy to set up and it seems to just work.
I now measure temperature and humidity in a room and by my wine. There is also a bottle of water between the wines that has a probe installed, so I have the temperature of a fluid between the wines.
If you want an easy system to log the temperature and humidity, it is a good choice.
Regards
Morten