My final inputs on this HOB Skimmer.....
After 1 week I'm getting great consistant dark skimming. Pictures shown are over the last 48 hours with the cup picture being what I cleaned just prior to writing here. There have been no leaks from the external plumbing or pump and It's been running 24/7 since installed. I've seen no increase temp effects in my DT. This unit does not effect the maintained water level in my tank nor have I seen any increase in the output of my ATO with this in the system.
If I wasn't sold completely on my ER nano skimmer, this HOB would be staying on my tank full time. I understand many people with RSM tanks will not like the look of this on their tanks. But if it fits your needs, I see it as a very solid, hard working skimmer.
Good luck with your tanks and have fun in this hobby! Tom