Kevin Brownwrote a review of Black Diamond Contact Strap Crampon on February 9, 2011
I am extremely pleased with these crampons. I have been putting them on a semi bulky size 10 winter hiking boot. If I was one shoe size bigger, I'd need the extender bar. The crampons come with a little more strap than you need, so I would recommend cutting off a few inches.
I've never had to touch or adjust or tighten the crampons once strapped on, they stay in place just as you would hope. I don't plan on doing any ice climbing in these, but these will be my go to crampons for anything short of that.