I'm with Ants on this one.
For me it's about what I trust and what I've had good experience with. Staintune fits the bill. Convenience also helps

. To my surprise my local dealer is also part of the Staintune dealer network.
I'd been looking at the others with the idea of getting a new muffler. Just from looking at the website Remus was too expensive. My other problem is that as I don't live in a place that has the convenience of
being on a mail delivery route or that has pesky items like street names/numbers I usualy run into difficulties getting large items from overseas. So many of them wont deliver to a PO Box number.
So, once I'm back from holiday the GT will get a new muffler. I guess I'm lazy but the convenience of just needing to make a phone call and then organising a day trip to the dealer wins the day. Might get an 18 tooth front sprocket at the same time