recently finished my Keisler install, thought Id add to the conversation here....
I had some missing parts from my order, the tranny had a bad Neutral start switch installed in it, and I had a struggle getting the right flywheel from them. They also shipped a lot later than they originally promised when I put down my $$. I had to do all the calling and efforts for contact, re-contact.
That being said, they came through in the end. They handled the missing parts and bad parts with class. When the flywheel did show up, it was the right one... But, theres always room for improvement.
Overall, Id buy from them again, but I would also expect some hurdles rather than a straight bolt in job. Considering the magnitude of the conversion from Auto to manual, you have to expect some.