The Atlas crank was one of the first components designed for tough XC 'All Mountain' bikes, and it's still a super tough, premium piece. The stiff 'I Beam' arms are fully CNC machined from 'Optim-Al' alloy with crisp, clean edges giving the unique Race Face look.
A medium walled cromo axle is fixed into the offside crank for an impressively stout feel underfoot and we've beaten the crap out of them without any worries. They are a real strain to install/remove though, so have your spinach before any spannering.
The chainrings shift fast and last reasonably well, while the CNC outer ring has taken a massive amount of log/rock hammer on big rides without breaking or bending teeth.
Sadly, bottom bracket life is at best average, and like most external setups, accurate frame facing is an essential for good fit/wear. They're not cheap either.