Isn't it fun? So quiet. I learned one thing immediately. As soon as you push down on a pedal to get started, SIT. I almost got lobbed right off the bike as the pedal came on around and raised me up unexpectedly! I can't wait to get a little time to rebuild an old bike into another fixie. I haven't had one since I had to "unconvert" my old Bianchi back to a multi-speed.
Riding a fixed gear feels like a connection to the cyclists of 100 years ago. Kind of pure like you are part of the bike or it is an extension of you, putting you firmly in touch with the ground.
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If it ain't broke, mess with it anyway!