So far this has been one of the coolest and most fun pieces of household technology we've picked up for our new house. Foolishly easy to install , excellent after-sale support and its actually fun to use. It is too early to see if it will pay for itself as advertised but even so, its still much more accurate than the original mercury switch it replaced.
I'm a big fan of Bluetooth devices, and my new install of Windows 7 refused to be work with the BT adapter I had. After reading the only reviews for both the product and the vendor, I opted to go with this product. It works exactly as described and so far has been a pleasure to work with. The provided software is a bit quirky, and thus the 4 stars. Nothing fatal, just not perfect.