In reply to rockpool:
Been using a pair very similar to these (camp ice rider crampon) without any hassles up to and including grade 4's. They're great for most stuff up to 3, and useful for more mixed type routes above that. Good "all rounder" in terms of mountaineering - never had any balling up problems (have the rubber anti balling plates) and have enough freedom in the hinge to use on various types of boots (yo ucan get them in full strap on or rear clip in).
Have moved up to more rigid based crampons this winter only because
a) I got a really good deal on a pair of technical crampons
b) Looking to do more ice-based routes this year - this is the one thing that the Ice Riders sometimes struggle with (hard, steep water ice)
http://www.sierratradingpost.com/camp-ice-rider-semi-auto-crampons~p~68528/...
Cheers,
Gordon