Had an S4 ridden a 675 and now have a 955, out of the three the most uncomfortable was the 675, and that was not too bad, I got used to the S4 and found it ok for 400miles+ but did end up with painfull knees and butt, the 955 is ok for more, the most I have done in a day on the 955 is 590miles and was ok but need a gel seat. I am 6ft 2inches and about 15 stone. :-D