Kat,of what I might not learn because I'm dealing with the drysuit. There is so much to learn. Overall, I think the cost of renting the suit ($50-$100) is insurance to help me get the most out of training (which is much more valuable in terms of time as well as dollars). Even if I don't wear it, I wouldn't be upset about it.
Check with Mike G about a good deal on a Fusion rental & check with me before buying one !