I have Patrick's SS exhaust and one thing you need not worry about is quality on these. I haven't started my truck yet so I don't know how they sound. Mounting everything took me about 1/2 hour by myself.
I too am a victim of the crappy Fenton / Offy fit. I spent about 6 hours filing and grinding to get them to fit. I thought I had it all set and had my exhaust ceramic coated. When it returned I found that my hold down tabs needed to be ground some more. There has to be a better way!