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I think this has been posted in a few different areas here over the past day or two. I posted in another thread but I'll echo what I said.
My boss recently (couple months ago) had his second gen CTS-V worked on there. I warned him of Hennessey's past and he even read some online reviews but still went to them. He had heads/cam/pulley/headers done. They said it would take about four weeks to do. It ended up taking around 5-6 weeks. Our point of contact mysteriosly went missing and we didn't get contact from Hennessey for two weeks (past when the car was supposed to be done) we finally got a message back from someone new, saying the other guy we were dealing with no longer worked at Hennessey.
I will say though, the car ran strong at the Texas Mile a couple weeks later. Going 186 mph and faster than the Hellcats there.
Just another reason why I do literally everything myself. I rather spent $20k on a lift and quality tools than wasting it in a shop. I think I'll add my own dyno to the list.