If you read my post on the 15mm vs 12mm axle, you've seen pretty much all I've got for opinions. Wireless is AWESOME, so I'd be hard pressed to steer you to the Comp unless you really can't afford the Elite. The SL is worth it over the Pro, but I don't think the Pro is really worth it over the Elite.

EDIT: ALL the hubs have the 15mm axle now, which is a great change. see below for more info. My apologies for not being up to date.

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