I've rented points for my upcoming trip and have booked a split stay with two different brokers. I just felt much more secure going with a broker rather than direct with a stranger. The brokers do a few things (hold onto money and write up contracts) to make the transaction more secure. It also allows you to pay by credit card rather than making an international money transfer. Most credit card companies will support you if you end up getting caught up in a case of fraud.
My first 5 nights are in a BWV studio - Boardwalk view, that I booked through the DVC Rental Store. My last 6 nights are in AKV Studio - Standard View Jambo house, and I booked this through Davids Vacation Club.
I know that even going through brokers is not 100% safe, but service from both companies has been excellent and I'm presently feeling very at ease with both reservations. If you want any more info on the type of service I've got from both companies, and which one I prefer, let me know and I'll PM you. Not sure how much I can say on here, before I start breaking forum guidelines.
Just a few days after making my bookings, I could view them both on the WDW website and I have linked them together. I had no trouble getting the broker/owner to attach the Magic Express bus to my AKV booking.
It seems, from a bunch of threads I have been reading, that brokers are struggling at present to get enough owners to rent their points. So, if you go with a broker, it's probably a good idea to be a bit flexible with where you want to stay. If you need a lot of points, keep a split stay as an option as I've heard that brokers are struggling to get huge amounts of points for one booking. Also, some of the more desirable room choices book out bang on the 11 month mark (the cheaper AK Value villas, and BW Standard View Villas are prime example), so if you want any chance at getting these, I would start making enquiries prior to the 11 month mark. Either way, I definitely recommend starting your search prior to 7 months. It becomes increasingly difficult after this to get what you want. If it makes a difference, DVC Rental Store don't charge you a deposit to check availability, while Davids does.
When I first made a request with David's they had no points for any of my choices. So, I then enquired with DVC Rental Store, who said that they had points for BWV. The next day Davids got back to me and said AKV points had come in. I jumped at both. I'm really excited.
Lastly, just so you know, going through a broker, your booking is final. I think that going straight with the owner, they might be a bit more flexible about changing the date of your booking should the need arise. Canceling your booking with either option is very difficult, if not impossible. You have to pay upfront (David's charges you the full amount at booking and DVC Rental Store charges you about 2/3 of it), so make sure your dates are definite.
Sorry, this is way more info than what your question asked for, but I hope it helps.