Jedda's gonna hate me for thinking I'm trying to rain on his product's parade. If you scan the air cooling forum for the OCZ vs CD vs cool spot thread, you'll see a few of us sharing our tidbits about our experiences with various RAM coolers.

OCZ's pushed the least amount of air yet generates the most amount of noise, possibly due to the restrictive nature of the grill. However, in terms of aesthetics, it ruled the bling factor.

CD's were much quieter and exhibited no mechanical noises when undervolting. Their mounting mechanism is much better than OCZ's (which has this annoying rocking tendency).

Antec's cool spot is probably the most unique. It wins in terms of performance and quietness at full speed, but the included fan makes mechanical noises when undervolted. The only other drawback is that some people don't have the room for the "arm" of the cool spot.