Have just switched from B4 to RB5 and had mixed results. I think the B4 is slightly better and quicker indoors but its outdoors that counts and from what ive seen the RB5 is a much more stable car on a bumpy track and can be pushed harder when there is high grip ie grass, astro. I think it just struggles on the low grip surface like at worksop. Mine was good at Bury where there is more grip and is no better or no worse at broxtowe than my B4. I just cant wait to try it outdoors now though...Im sooooo fed up of this indoor stuff...
