I'm now able to average 16.7MPH on my commute. It's 8.1 miles and not at all flat. If I cut back to 15MPH, I'm a lot less tired and sweaty on arrival. Taking the car takes me about 30 mins and is horrible and I have a 10-minute walk to/from the car, so the bike is a win-win for me. I still have the horrible front forks, but getting hold of some threaded 1 1/8" disc-compatible suspension forks ain't easy. The BB7 is a revelation after the crappy original front brake.
Woosh have a new bike out, the Karoo, which is almost everything I'd be looking for in an e-bike. The only fly in the ointment is that the top speed doesn't seem to be tweakable to anything illegal.