JMac,
The Whirlwind is not a pearl. It is a solid. They WW has the same cover as the Clean just a different core. I personally like the WW better than the V2 Clean. The Clean in my hands was very touchy down the lane...if any carrydown it was bad, if the backends were real clean it would go left (right handed) very hard. I find the WW to be much more consistant (likely due to the core difference, light bulb).
Jeff S.