Me and my fiance' are getting ready to get our certs, next month, july at the latest. I've been reading alot of the reviews and trying to gain as much knowledge as i can. Their's alot of things i don't understand, but first things first. What is the advantage of the open heel, or the full foots. We will mainly be diving tropic type water, and maybe some here in a couple of local lakes. I know we will be buying shorty suits, and probably eventually, full, but i don't know what the difference or the advatages between the 2 types of fins are. One more question, is Split Fins vs. Blades, what are the differences, and the advatages to both. Thank You.