i used to own a 650c fixed. just sold it tonight
I loved it. never did a bar spin ever it had a really high bottom bracket thats important but i did still pedal strike sometimes. I was limited by the gear ratio I could run because I couldn't fit a bigger chain ring near my chain stay, and they didnt make a smaller cog.
wheels had to be custom made. but i did love my rear mavic open pro and it was fairly cheap.
BUT TIRES WERE NOT cheap!!! and tires were hard to find, and it was best to buy inter tubes in bulk when i did find them
the only reason I sold that bike was I got tired of dealing with the wheels and tires after a year