As others have said above, the cubes do wear out relatively quickly but perform really well. Ideal for big AD ridges etc.
I'm on my second pair, and still have the first which I've had resoled. The uppers are now fairly wor on the resoled pair, but good for when you're not on snow so wet feet aren't an issue.
Warmth wise I use them on techie 4000m peaks in summer, and some people do use them on Mont Blanc but for me they would be too cold up there on all but the warmest days.
The other super popular option seems to be the Scarpa Ribelle light, but I hear they wear out just as fast (if not faster)... That's the price of light-weight boots.