Flip-Fop Hub - worth it?

pip I'd always go fixed/fixed because:

1) Can screw a freewheel onto the fixed side.
2) If you head down to Herne Hill you can have your race/training gear on one side, you're getting to HH gear on the other.
3) Got a spare set of lockring threads if you strip a side
4) Got a symmetric hub so will build a stronger wheel easier.

+1

Bought a flip-flop when I first went fixed, now have a useless freewheel that was last used two years ago. Rims are good though so can't be bothered to rebuild.