Anyone play Crysis on steam? (stability question)

Does anyone know how Crysis runs on steam? I know in the past ive had difficulties with non valve games on Steam, and I would just like to know before I purchase Warhead + the original.

Thanks for the comments.

available september 17 in north america and september 18 worldwide.

but i don't see why this version would be any less stable than the retail. all the steam games i own run just fine on my computer.