i used to run a one piece bitd,i think it was a TIOGA task force hollow one.never had any probs with it!I always wanted 3 piece cranks as a kid,probably cos all the pros had them,so i went for a set of Profile retro 3 piece.I love them but there is a part of me that thinks i shouldnt have bothered spending the £250 and gone for the opc as i think the one piece looks cleaner.everyone i knew had one piece cranks bitd,who could afford redlines as a kid(or now!!)