Im glad theres a thread on this.
I just ordered a set from work (BMW) and they are the GSD3's. I didnt know which to get in the 2s or 3s so i did a google image search for the tread pattern as i recognised the tread i wanted and ordered the 3s.
Ill let you know how they are when i get them scrubbed in and on a dry bit of tarmac.
Whilst were on the subject, my work quoted me £54 per tyre the otherday, then today when i came to order them i was told they were £71 and this was "trade" price. Can anyone confirm whether this is true? I want £54 damn it.