That is a fantastic price, I phoned them but they didn't do my make.
I've used gsd's before plenty of times, always always found massively better tyres, even the old goodyear eagle ventura was better.
Rainsports kick f1 in performance terms, as do my fave now tyre, HANKOOK VENTUS EVO 12, company gone from a nobody to 7th largest in a few years and fastest growing tyre company period, won more awards since introduction than ohters, inc all the top fave ones ie F1, pilot sport, zero nero.
When tested with competitors top tyres they have not ever been beaten on stopping distance dry or wet, and basically hammered all the competition in all the german tyre tests, comments were why buy anything else, it isn't as good is a favourite expression.
tabetha