So far, so good with Velvet Thunder here in my Zone 7b garden. It was positioned to get pretty direct sun all afternoon, and seemed to hold its color fairly well. It didn't "melt" or get all glossy/shiny like some other deep reds.
I got the plants from GH Wild at the end of March, so it was nice that they bloomed at all. Not terribly productive in their first year, but I'm withholding judgement until this year.
FFE on July 5, a bit splotchy:
LFO on July 10, with Siloam Tee Tiny -- I really like this pairing: