I like the SuperFlash (that was my SF v. Swerve video), but I got a CB to try out. The CB's beam pattern is wide, thanks to the collimator, so off-axis visibility is pretty good for a stand-alone taillight. Just make sure to get it aimed level so the best part of the beam is on-target.
edit: I wanted to point out that NiteRider
advertises that the Cherry Bomb has a reflector lens that provides visibility even when the light is turned off.
I feel this claim is misleading. The Cherry Bomb is nowhere near the reflective performance of even a basic CPSC red reflector, let alone a really good reflector. I really have no idea why they're making this claim. Do not plan to substitute the CB for your reflectors.
If you want a blinkie that's also a legit reflector, get a Planet Bike BRT-5, or the much weaker Cateye LD500 or LD500-II. If you want a top-notch reflector, get some red
Reflexite V82 reflective tape and stick a stripe of it up each seatstay, or up the rear of your fender if you run full fenders.
The Blackburn Mars 4.0 is also quite powerful and has a pretty large hotspot in its beam, so that's another contender.
BTW we got some SuperFlash clones in at the LBS. They should be called a PooperFlash... project the beam pattern onto a wall and you'll see it's no substitute for the genuine SF.