The Planet Bike Superflash is a great inexpensive option for a tail-light, but the Dinotte really is in a league of its own. I've got 2 Superflashes, mainly as backups to a Dinotte 140 (plus I got them first). The Dinotte blows everything else away. Is it worth $100? Only you can decide that, but if you ride a lot in traffic, then the answer is probably yes. It is the only tail-light that is really visible in daylight.