I think I have the OEM from ledshoppe:http://ledshoppe.com/Product/ledp/LP3019.htm
Good: bright; long lasting batteries; cheap ($5.00)
Bad: the strap quality is bad, especially if you tend to move the lights because the tab starts to wear and you can't strap them. If you don't move them off the bike too often, you shouldn't be concerned.
They also tend to turn off by themselves when I hit a bump in the road. Sometimes I also have to move the light around to turn them off or to switch them into another mode (flashing or solid).
I have one mounted on my handlebar and one mounted to my fork on my SS. The one mounted to fork is the one I broke the strap to, so I use clear tape to strap it on. If you have a fully functioning strap, the only problem you might have is clearance from the extra strap to the spokes.
I'd say for $5.00, pick up one or two and see how you like them. Hope that helps.