I would stick with the P5. O.S. usually is top notch, but the VZ has some issues that need fixed. I have also seen a VZ with the crank snapped in half, motor wasn't broken in yet, it snapped on the starter box. I love the RG, but if you want an upper end motor stick with th P5 or WS 7 II. The Rg really isn't that much underpowered compared to the P5 and S7 so if you must have an O.S. get the RG. If you run on a short track or bash in the back yard the RG is king.It is a really snappy motor,it comes out of corners like a bullet!!!
