Rode the BD (don't groan) Dawes SST to work today (10 miles, a few hills). It was most excellent. I only had to stand up to climb once.
I am used to doing the commute on the road bike (12 speed) but from now on I will be using the SST.
I don't have a FG cog for the flip side yet, but want to try...but was wondering...does the collective knowledge of the forum recommend keeping the same gear size for FG and SS? It looks like Sheldon Brown's site suggests the fixed cog should be 1 or 2 teeth smaller than the freewheel...but I am not so sure I buy his logic (and I can't ask him directly!).