I just got mine set up today for 2 strings of 6 to a sol-ark on TS4-A-O's. Right off the bat I noticed you only get 15 minute increments and seems to be at least 15 minutes behind. They sell a premium service not too terribly expensive that gives you 1 minute increments and some more datapoints.
Systems with less than 35 modules = $20 per-year
System with more than 36 modules = $0.56 per-module/per-year
I'm not impressed enough to not try and get real-time monitoring from the device itself.