Ok ...... misunderstood!
The RB5 is probably the most neutral 2wd I've ever driven. The rear end is quite locked in which bothers some people but you can get loads of front end grip as well so in effect you get the best of both worlds when comparing it to the Losi or AE cars.
Only 2wd I'd change to is an X6 but as that is a very expensive option compared to the RB5 (asuming that you have to by a B4 to convert then the conversion kit) I see no advantage over the RB5.
I'm trying to get somebody to host my set-ups as I can't post them here due to the file size limitations