I just put a PIAA conversion kit on my Yahama Grizz and love em. The cheap set I got off Ebay for the Grizz was a piece of shit and didn't last a month so be carefull.
I also have 4 converted Fuego's that I got from KBROWNCUSTOMS.com for my buggy build. I have lit them up just using a battery and they seem to work great. Will not know about the dependability untill I get them mounted, but others seem to like them.