I went Jan 2011. It was amazing ! Colin knows his stuff, knows the people, and is great to get along with.
I have talked to a lot with a few of the other people that have been on his trips before and they all love them. Many things to do, and the nice thing is that he keeps adding different things every year. I really really want to go back on the Nica trip again, it was so much fun ! I can not recommend these trips enough.
Which date are you going ?