We bought our first contract from Disney (AKV) and our second resale (BWV.) Resale saved us a couple of thousand dollars... we also bought more points than we had intended to buy, since we found a great resale contract. (We were planning to get 100 or 125 BWV points, but we found a 150 point fully loaded contract with all the previous years points banked and all current points for a good price, plus it was our UY.)
The disadvantages were that it took longer, and we had to pay closing costs. (However, even paying closing costs, we saved almost $2000 over buying the same number of points from Disney _plus_ we got banked points.) You make an offer, then you wait for it to be accepted, then you wait for ROFR, then you wait for closing, then you wait to get into the computers so you can use those points. From when we made our initial offer to when we could book was, if I remember corrently, just about 2 months. I have heard of it going faster for some people, but it didn't for us. We also had some concerns about them correctly linking our two contracts, but it all worked out in the end.
The broker we purchased from wasn't very good about keeping us informed about where we were in the process (for example, we had no idea when we passed ROFR), but we didn't really need much handholding, so it wasn't a huge problem for us. She could have made it a little less stressful for us, and she didn't, but the transaction ultimately was successful. I would use her again, or any of the well known brokers on these boards, to buy a contract I wanted. I get the impression that some of the major
DVC brokers are a little more responsive than others, but I think they are all honest.
So I would say it was a little more of a hassle, a little more stressful, and quite a bit cheaper to buy resale. I would, and probably will, purchase resale again if the contract and the price were right. I would also purchase directly from Disney again if the incentives were good enough and what I wanted wasn't readily available yet resale.