I was on the Aggressor to Cocos in May - The trip of a lifetime - I doubt I'll ever top it - Exactly as it has been described. Most of the time, before and after the dive, we discussed how it was we were going to explain this amazing experience to people when we got back, and finally we just decided that it truly couldn't be described to do it justice. Its like is like being engulfed by nature, both topside and in the water.
On the topic of seasickness - I need prescription meds just to fly, so I am not an easy traveller - I had about 20 scop patches and 3 bottles of dramamine (drowsy and non-drowsy) with me and besides the 2 I gave to my roomie, ended up with 1/2 a patch when I got home and a couple dramamine, but I never regretted the decision.
The crew was awesome, we were fed well (22 dives and I didn't lose weight!) - I am still going through Cocos withdrawal 2 months later... Thank God (and Javier) for the video and pictures... (which for some reason, I'm not able to upload...)