I've never had problems with OBX in the past for the header/exhaust combo I used to have on my ZX3 and it's nice to have another company produce something new for the MK3. That being said, I'm probably not going to buy the OBX, and I don't particularly car for any of the other catbacks for the MK3 on the market currently. It's going to be a custom exhaust for this guy complete with Borla mufflers and Titanium tips for the same price or less than the OBX.
EX Zetec Crew #44
2003 Focus ZX3 -- RIP
Sonic Crew #24 -- 2012 Focus HB SE - Traded
Upgraded Sonic Crew #24 -- 2014 Focus ST