I have a Two Brothers C2 slip on my F4i for 6 years and never had any issues. I guess the rubber protector around the mounting clamp tore after three years, called up Two Brothers and they sent me a free one with in a week, no questions asked. I thought that was great customer service. A buddy has had the full Two Brothers system on his 954 for five years and no issues, it sounds great. Ive been reading and reviewing the arrow, akra, arata, and leo vince slips ons to see if they are worth the extra money but I still like the sounds of a two brother slip on the bike better than any others (soley based on online videos). Can I hear feedback on why Two Brothers seems to be unpopular or as "squidly" as I read somewhere on here recently?