Yes I don't know all the 'ins and outs' but the REO50 is apparently a HUGE improvement on the REO40, and by the sounds of it lasts a lot longer too
I was seriously looking at Falken 452's as they are a good price but I don't want to be dissapointed and wishing I had paid that little bit extra for the Bridgestones, especially if they don't last as long
Falkens are a pretty good mid range tyre for me, but I'll be going with either ps2's or re050's if I can get them next time as I just loved the feedback and grip from the ps2's, they inspire massive confidence both on track and off.