I had been riding mountain bikes and road bikes constantly all my life, and have been riding almost exclusively fixed for around a year. When I flip the flop, its now hard to ride with the same precision and its actually much harder than when I initially switched from freewheel to fixed back last summer. In fact my only crash this year was when I had flipped the wheel for a day and was trying out freewheel, it had turned so confusing and weird haha. Interestingly when I go bck home and ride my mountain bike, everything fine. But now I kick myself for having an ugly, heavy freewheel installed o my wheel, and not having invested in fixed/fixed to have two different cog options.