any of you guys out there have any experence with kamma surface drives.i am looking at a 37' formula.how good are these drives and what about parts,cost?i have never owned a boat w/surface drives so i do not know much.thanks.

Take a look around the site there are lots of threads talking about them. The Boots and cases are the things you need to look out for. Everything else is fairly off the shelf stuff from what I have read.