Rode fixed since 2008 and only the last 2 years have I gone back to gears. However IMO and it could be all in hte mind but I feel my cycling has improved alot my pedeling technique is much improved. My legs are stronger and can go nearly as fast as my geared on the commute. Now that the weather is on the turn and its darker in the mornings, the fixed will be out most of the time. Its the perfect winter commuter IMO but others will/may disagree. As for all that Zen like feeling, for me its not about that, it just keeps you fit and honest as there ain`t know free wheeling !