I bought a Monnit sensor and ethernet gateway to play around with. Nice form, but less than kind config options. Out the box, you can not have a sensor reading at less than 10 minute intervals. In my world, that is useless. I could do better by walking through on occasion and sticking my finger in the air. To get intervals under 10, you have to purchase add'l software or by the modbus gateway and configure yourself. Then at that point, they are unsure how their batteries will hold up. I am sending them back. Am I crazy to think that most users of a sensor network would want readings in less than 10 minute intervals?
Regardless, I have started down another path. Along the whole IoT idea, I am going to build my own sensor network using Arduino or Galileo/Edison plus zigbee. I was initially "too good" to consider such options, but then I started paying more attention. Options galore and countless configs. Low power, solar, ethernet/modbus/zigbee/wifi/analog/serial/whatever. That and I get to dust off my c or c++ hat. I am sold!