I've been riding at 325-350 for two years/8,000 miles now. I'm not sure about the Ironhorse, but there are plenty of choices out there. Spend your money on a hand-built set of wheels with 32-40 spokes. He will be fine.

Tell him to join Bike Forums and go to the Clyde section. There is a WEALTH of information there in the stickies, and friendly helpful folks!!!