Given how many times I've wanted to strangle people with bright flashing lights, and that The Netherlands and other countries have gone to non-flashing, and the difficulty I've had judging a bicyclists distance when I'm driving and they're flashing (and none have been very sexy), and how many times I've wanted to strangle people with bright flashing lights, and how much I hate people with bright flashing lights, I never use flashing lights.

And, it sounds like there will be a bill in our house this session to outlaw them due to the complaints from drivers.

That said, possibly having a fairly bright steady red in the back with a much dimmer flashing red might provide enough alert to motorists without them wanting to strangle you. Similar for the front.

I think reflectors are key. My Marathon's have reflective sidewalls, red on the rear rack, white towards the front, and yellow on both sides of both pedals does a great job of screaming to motorists that I'm there and riding a bicycle.