First of all, don't get this unless you know the size of your steerer (1" or 1 1/8"). Secondly, don't get it unless you know whether your crown race diameter is 26.4mm or 27mm. If, however, your bike takes a 1" threaded headset and has a 26.4mm crown, you're set.
This headset is a beautiful bargain for the money and will last you thousands of miles. Don't go any lower-end than this -- you may find a cheap Ritchey Logic, but it's got plastic/rubber races where this is hardened steel. Don't skimp on a few ounces when overall ride quality is concerned.