I had a couple 1911 slides done by them and ran into some long (or longer than previously indicated) wait times, but it was literally at the same time as they were clearly hiring more staff and trying to buy new machines to deal with increased volume. I can totally get growing pains and I think they've successfully worked through this last phase of them. When I had a problem getting correct spare screws, Scott was extremely responsive and helpful. He'd initially told me the wrong screw dimensions and once he realized it he even offered to pay me to reimburse what I'd spent buying the wrong ones. If I recall correctly I had him responding to my emails in 20 minute intervals on a Saturday.
I'm very happy with the work on my guns and would probably only consider Impact if I was getting HKs milled (cheaper and shorter wait time than Wright, more finish options than Langdon, including DLC).