My take on this "magic" setup idea: One setup won't work at say, the indoor Tiverton track and a carpet track, but what I found with the XX4 & now the RB5 is that the starting point for both works almost all of the time. Both cars seem tolerant of varying conditions and from a base setup their handling varies from "OK" to "great" unlike say, the Yoke BX which varied from "almost unusable" to "dialled". For example, the BX was beautiful to drive on damp astro but as soon as the grip came up, the same setup became a twitchy grip-rolling nightmare to drive. I'd have to change springs, oil, roll-centres, anti-squat & wheelbase to get it to work again. Same conditions with the RB5 & I changed nothing. I started with Roger's recommended setup but changed slightly to suit me. Since then all I've changed at a meeting is front springs. I admit that I've only used the RB5 on wet & dry astro + dry grass but that covers 95% of the tracks & conditions I race on.
Ultimately I suspect that if you're a world champion class racer there are faster chassis's out there than the XX4 & RB5. At my level (F3) I find that stability and a forgiving nature mean faster times that something setup to suit an F1 driver.
Back to the point of this thread, the B4 is no way as bad as my Yoke example. I've driven B4's for 5 years and it's a great car - strong & fast & doesn't need huge setup changes (but more than the RB5) It's just that I prefer the RB5's stable "push it hard" feeling instead of the B4's ultra-agile "drive it round on tippy-toes". From what I've read I get the impression that the RB5 is more similar to the Losi in that respect, only with more steering.
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