I have had Trinity porting on several National race TT/ST Banshees. I have NEVER had any problem with anything they have done. Service has been great and I have always gotten what I have paid for. They have done both standard and Cheetah PV cylinders for me and I have been VERY satisfied. They arent cheap, but they do good work.
Now that injury has ended my serious racing career, and because of homework done on here, however, I am going to Jim at Passion for my newest banshee endeavor. He's a straight up guy that knows the right questions to ask and wont stick it in your ass. Im shipping out a pair of cylinders to him this weekend for a Hot MX port, bore, and new pistons. I like what I hear from Passion and have read alot of good things on here about him as well. Im one of those anal people who does his homework before plunking down hard earned $$ on porting.
I have nothing but respect for Trinity's work. One word of caution though, make sure you talk to a TECHNICIAN about your porting rather than the jughead that answers the phone. Hard telling what you will get. Make sure that you and the technician are CLEAR about what results you want and the work you expect, get his name, and make sure that you send a letter with your cylinders, including the tech's name, with everything that you two agreed to. Don't ask me how I know this...
I wouldnt be afraid of Trinity if you take a couple of extra steps.