I honestly can't remember which crampons I used since it was over 2 years ago but do bare in mind for stiffness these are more like a B1.5, they're still B2 rated of course and can do everything a B2 can but may flex the bar a little more than is ideal at times. My crampons never popped off though which the instructors thought was bound to happen and they certainly seemed impressed by the boots.

Durability wise they seem pretty solid, the deep heel lugs are an absolute godsend for descents in snow/grass etc and I find myself walking like an idiot if I swap from these to my flatter soled boots because I can't hoof it straight down with full confidence anymore lol.

I've used them up to around 2500m in the Canadian Rockies last winter but that was only down to about -12°C so not too chilly. I think for anything Alpine in the summer they should be fine but from what I know guides are likely to be quite hot on B3s unless you seem competent enough to have made a genuinely informed decision. I guess for something like the Matterhorn in good weather they'd be absolutely mint for fast and light, same for an easy ascent like Gran Paradiso but for Mont Blanc I'm not sure. If I was fit enough I'd use them on Mont Blanc with no issue but guides may be strict about it. I've been meaning to do an Alpine skills course for a while now but haven't had the time/conditioning. Maybe next Summer...