The rasps Stew Mac sells are FANTASTIC. However for the love of god DO NOT hit metal with them; I have had a lot of rasps over the years of various age and make, and some can 'take a hit' if you accidentally nick or clip a piece of steel/brass. The stewmac rasps are absolutely spectacular until you just barely clip some metal, then it's all over. I think it's obvious (to me anyway) that they are not as hard as some others, but when new, holy sweet lord do they cut, and smooooooooooooth.
Stewmac runs a lot of sales and discounts so it's good to keep your eye on them until you can get them at a price drop.