I've had 2 pair of SIDI shoes...a pair of Titans (older red pair) and Genious (4?). The Titans were great for a few years until I started getting hotspots and replaced them with the Genious 4. The Genious are still in near new shape but I started getting hot spots with them too fairly soon. I've noticed the Genious seem a bit narrower than the Titans. I have also been pulling my hair out chasing down a nasty bike creak, that now sems to be the Genious soles. I think this is it, since after going on a 50 mile I heard them creaking while walking on a tile floor. I flexed my feet different ways and sure enough they creaked like an old door hinge. The soles still feel stiff when I try to flex them in my hands but I guess that isn't enough force vs. them on my feet. I am debating getting another pair but am interested in other riders views on their Sidis. Today I've seen SIDI Titans with carbon soles for $145 and SIDI Genious 5 with Millenium 2 non-carbon soles for $148. For a little rider info I weigh about 190-195lbs and pedel at 85-95avg cadence on typically flat & windy sea level roads.