I made a comment earlier in the thread about not really noticing any difference between T1R-s and F1As - have to admit that I driving in the torrential rain that we had yesterday and they were superb, pretty much felt no different to dry weather! Certainly don't remember the T1-Rs being as confidence inspiring in such poor driving conditions.
Indeed, the T1-Rs are far from great in the wet, I've never had any issues with normal driving in the wet though, I've seen much much worse!