I recently had the pleasure of using the RIV lights to set timing on the SD, courtesy of one of our esteemed members.

By far, its a fabulous tool. Once you get the lower bolt released, you can set timing in about 10 minutes and it is guaranteed to be accurate within about 1/4 degree. It simply does not compare with the traditional method.

I was considering buying one and putting it in the rental pool. But, if MB Doc is willing to rent his for $25.00, that is definitely the way to go.