I've got a Clutchmasters / Fidanza in my car, and it's great. The friction surface is rebuildable, so it'll last as long as you maintain it. So far though, it looks good. There's not much wear on the friction face at all, even 20k miles after installation.
By the way, replacement flywheels are almost always a better option than machining your original flywheel. You never know what you might weaken when you remove material from a chunk of metal that wasn't designed with the new geometry in mind...