I've been liking my Radbot 1000 much more than the Superflash. It's been through some light rain with no problems, when it survives a real frog-stranglin' downpour, I'll know for sure. My Superflashes never could do that.

Downside is about half the battery life, but I use rechargeables, so that's not a big deal to me.

*edit* I recall now that I had the Radbot on my last tour, which saw all-day rain a couple times. No problems with it, either.