I'm very happy with the standard GTS 8-way seats with Alcantara in my Gen II. The bolsters make it a little more snug than the standard 8-way seats that I had in my SD [again with Alcantara] and both extremely comfortable on long journeys. The Alcantara showed no signs of wear-and-tear after 3 years in the latter. The GTS ones do grip you better when fast cornering.
The Alcantara, now Race Tex, is cooler in summer and warmer in winter, the heated seats warm-up faster than with all leather too.
SD GTS