I bought the ViewPoint EVO Dual Headlights from Performance. I tried them out, but I wasn't too impressed. Here's what I found out, so you can make your own judgements.
The mounting clamp has removeable rubber inserts so supposedly you can fit it on larger handlebars. I have 25.4 bars. In order to mount the clamp over the bar tape I had to remove the inserts. I can't imagine the mount would fit over bar tape on 31.8mm bars. I wasn't too impressed on how sturdy the mount was, but the lights did stay put for the short time I tried them.
The only adjustment is vertical which is made my adjusting the mounting clamp. The two lights cannot be adjusted independantly and there is no horizontal adjustment at all.
3. Light performance
The set comes with a 20w and a 10w halogen and each light can be switched on seperately. Turning both lights on puts out a lot of light and would certainly be adequate for most nighttime riding but I didn't find them to be exceptional. Both lights are spot. It would have been nice if they had made the 20w a spot and the 10w a flood, but such is not the case.
4. Battery + Wiring
The wiring was the one thing that really stood out on these lights. It seems really sturdy and top notch. Everything seemed to make good firm connections and I can imagine it all would have good water resistance. The battery is only rated for 1 hour of operation with both lights on. It mounts to the frame pretty well and I can imagine it would fit well on a number of different types of bikes.
The lights were on sale for $149 at performance. With the 20% coupon code, they came to $119.20 and you get almost $15 worth of team performance credit, so I guess you could say it costs around $104. It's not a bad deal, but I think I'm going to return it. I'm going to spend a few more bucks and get a CygoLite Z-Force HID NiCad setup.
I also bought the ViewPoint Flashpoint Taillight. As soon as I tried to mount it, the mount broke. The mount is a complete piece of crap. I was very disappointed because I was impressed by the taillight itself. I really liked the idea of having a reflector built into the light. The lights themselves seem very bright also.