I have been running only RB engines for the last 4 years with great success. I have never had a motor with the level of dependability and power that I have experienced.
I recently attended the 1/8th worlds in Ohio and spent 3 days with Rody & Bernard from RB. After seeing the level of support and gratitude that they give there customers, I personally will probably never run any other motor out there.
Buy one, you can't go wrong......