I got these cranks because bikeroom.com sucks. I ordered sugino 75s and they sent me these with no explanation. My bb didn't fit but they offered to pay for a new one, so I just decided to go with them. They never ended up paying for my BB so I was a bunch of money down the hole, and I didn't want to be bikeless for the month or more it would take to sort out. My opinion on them: very solid with good power transfer, but really heavy. I haven't had any problems with disc/crankarm seperation but only time will tell. Again, the only reason I have these was because bikeroom.com is a terrible retailer.