I am 90 % of the time M button OFF too. It is easier and more natural to manage throttle despite the fact that the lag seems more noticeable in default setting. I also noticed that overboost comes more predictable but then hits sharper in default mode which I like. In fact, what I would like to have is best possible response and least possible lag in non-M mode rather than the M mode. Exhaust mods helped already getting there and now I will add a filter plus a charge pipe and will probably stop there.
"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
2012 BMW 1M: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.