The act that no one has replied to your post can be good news.
I am an engine builder of custom racing and performance engines and sell hard core parts, and I am fairly active on a few different sites and I have a pretty large network of other engine builder buddies. I have not heard any negatives about them in any of the places I have been.
You might also just type in thier name in a search engine and look at what all comes up about them. If they have had many negative issues someone would be talking against them on some of the boards. Like I said, I kniw nothing negative.
Ed