Enermax used to be a super premium PSU. Since they've closed their factory they don't seem to be progressing with the state of the art. Do you know whether these are actual new Emermax designs or not? Or are they simply rebrands or off the shelf OEM with their proprietary features tacked on?

They used to be for sure and some of their top end Revolution models over the last few years have been good as well.I had a 465 watt Enermax I bought 10 years ago that's actually still kicking in a retro rig of a friend of mine.

I have a Revolution Xt 530W~ (the 1st gen) and it's awesome. . No noise. No heat, 0% whine coil in all the PC. I'm really happy with this PSU. I think I'll have it for 5-7 more years. Unless I need a smaller PSU in the future. (i5 4590, gtx970, 3 hdd, 7 case fans connected directly to the PSU).