I've used several and the Clear iBreeze (this one) has been the best. But I got the Silver one at work and it was crap. Flimsier material, broke easily, etc.
On my 15" MBPs, I've always had good results with just an iLap and smcFanControl (set for 2000rpm when on battery, 2500rpm when on AC and the battery is charged, and 4000 when on AC and the battery is charging).