I actually *have* a Quickbeam- I'd been looking at it since it was announced as I love riding SS on the road; I have a Windsor track bike from the 70s and a 1960s Torpado I converted to single-speed with Rivendell "priest" bars. I bought the QB three weeks ago and I've been riding it 10-30 miles every day since that the mercury has been over 45.
It's a real treat to ride. The 18 tooth freewheel is a bit low for the flatlands, but I have a 16 I'm putting on the other side.
There does seem to be a lot of interest in the bike. A few days ago a minivan pulled up alongside and the driver said "Hey- is that a Rivendell Quickbeam?"