I'm a little surprised that no one mentioned material. Veloce or "loose cog" cassettes, made from steel, are going to last as long as any steel cassette by any manufacturer, for any given cog thickness.* Titanium wears a bit quicker, though they are pretty tough, and "alloy" (Al) will go so quickly I think most amateur riders will want to only swap one in for one summer's worth of races, and train on a "loose cog" OF course YMMV, YMMV, YMMV , this is one case in which I couldn't stand to not type that.
*Meaning a thicker cog (think of 6 speed freewheel cluster) will last longer, but the wear disadvantage of thinner cogs is roughly made up by the fact that there are more of them in a 9 or 10 speed cassette IF as it was mentioned above, you're not sticking disproportianately in one cog. Over the years (and gaining # of sprockets) I do think I end up changing cassettes and chains a little more often.. tant pis.
Last edited by tvphobic; 03-24-05 at 10:20 PM.