The Good: durable, bombproof and stiff
The Bad: weight is a big issue
I ran two sets of profile cranks on my downhill bikes and never had any issues with performance or durability. These were one of the first solid cranks that came out during a time when square tapered bottom brackets would round out and crank arms constantly snapped. These were so bombproof that even Bender used them for his hucking back in the day.
The crank arms are super stiff and the bottom bracket bearings are very smooth and stay smooth after years of use. Installation is a breeze, removing the cranks is kind of funny as you have to use a special profile tool and then literally hammer on the crank arms but this process is quite simple.
The only downfall to these bombproof cranks is the weight, the arms and spindle, and BB are extremely heavy especially now a days with all the super light carbon DH cranks. There is a titanium spindle option but even with that I think this would still be fairly heavy crankset.If you are looking for a set and forget crankset that is bombproof and don’t mind a bit of weight I would strongly recommend these.