costs
surely any hobby is never cost effective its the pleasure ratio you get out of spending and adapting.
if 100+bhp from a SL rocks your boat go for it,personely I prefered to spend £8000 on 3 different bikes than on 1.
apart from straight line performance theres not much in it between my SL or T8 on the twisty bits.
the T8 is about 25kg heavier which makes a difference.