I don't know if Kyosho's prices are as high just due to exchange rates. In Germany, they are the only manufacturer who tries to charge more than 20 euros for a
pair of big bore springs. In my opinion they're either greedy or desperate and in big financial problems...
Cannot comment on the RB-6 other than I don't like the tall front shock tower, but my B-Max2 has been great so far!
Don't get my wrong, I used to be a big Kyosho fan, but experiences made with the ZX-5SP front hub carriers/spindles, Ultima SC axles made of cheese and part prices made me think twice when it came to buying another K car.