Sorry yes, yet another typo. 3.50 it is!
I can appreciate your wishes to stay rubber side down, as we all do, and so far I can say the Heidenau is nothing short of brilliant. Time will tell what the wear is like but with the grip it has I would imagine that it won't be the longest lasting tyre ever, that said though, at the price I wouldn't mind replacing them a little more often. (Especially as the construction seems to be on a par with even Michelin, after fitting no balancing was required at all!)
David, I haven't researched this at all but somehow I feel 'Heidenau' may be Pneumant under a new name, what with the tread pattern (also casing design) being the same on mine, the fact they're made in Germany & now that you mentioned they were standard equipment on your RT125 also. If I get bored later I may do some rooting to see if this is the case, if it is so then the grip situation has been pretty much turned around...