A few key points to know:
-As mentioned elsewhere, you need to put your request in ASAP. We opened an "Ongoing Search" online months before our trip. It took us almost a month before we got a confirmed exchange.
-It helps to be as flexible as you can. We were unfortunately stuck with a very small travel window, so we only had one or two possible checkin dates in our search. (I think RCI Weeks trades could only provide a Friday, Saturday or Sunday checkin)
But we were flexible in accepting any DVC property. We had a two-bedroom unit banked with RCI, but since there would only be two of us on the trip we would accept a 1-bedroom or a 2-bedroom unit.
We lucked out and snagged a 1-bedroom at Beach Club for the exact Friday checkin that we wanted.
-In addition to any RCI exchange fees, there is an extra fee ($99, I think) that you must pay to DVC. This covers Magical Express and the amenities that are normally included in your room rates.