Just got a set of Sidi SDS Sierra MTB shoes from Planet X (who've got a big job lot of Sidi shoes online at the mo). The SDS shoes are all manufactured by others, hence much lower price tags. They were £60, and a great buy IMHO. Size guides weren't too clear about the right size- my old DHBs are 44, the Shimano boots are 45, so I went with 44.5 for the Sidis. Comfortably tight but with plenty of wiggle room for the toes, the way I wanted. The soles have scuffed up nicely- that would be riding 250-odd miles plus walking/foot-downs, natch- but very comfy, well ventilated and they look great.