I have a Cayman 5 speed and I went with the automatic version because I too read about the alleged overly sensitive manual version. There was a member from AU who tried them both, returned the manual for the automatic version and did a brief write up about the experience. The distributor claimed that it happens a lot (returning manual for auto version). The member did a brief write up. I don't recall his handle. I didn't want mine to be too sensitive either so I just pulled the trigger on the automatic. No experience with the manual version but I am happy with the version I purchased. It seems like a nice compromise but I do think they are somewhat overpriced for what they do.
Good luck.