I love the interface! All the information that I could possibly need is there. I'm definitely interested in signing up if you do decide to make this a paid service.
Also, does your rig 1 always run at 80c? Seems kind of hot?
Now, this is a paying miner you want to keep. Not even his hardware and showing his concerns.

-tb-
Thanks for the great feedback, it's appreciated.
About rig 1, I have vent issues due to a temporary rain storm here, water infiltrates.
I have just set the fan higher to compensate, it should go <75°C soon ;-)