David's is not a travel agent in the typical sense; he is a professional points broker, hooking up DVC owners with renters and giving certain guarantees to both parties for peace of mind.
Not that I would never use him but I have rented points privately many times and always have a good experience. I have found owners through the disboards and another similar site, more geared toward DVC owners.
Keep in mind when renting points, the cancellation policy of DVC points is not the same as room only or package reservations for the general public. It can get complicated with point expiration dates and such so most owners do not offer any kind refunds. Owners often want payment in full at the time of booking, or maybe half down and half due 60 days prior.
I don't rent unless I'm 100% certain our trip will happen or just get insurance that will cover our losses. Most of our renting experiences were for short, 1-2 night stays pre-cruise or long weekends so I've never had thousands at stake.
If you have a certain resort in mind or you're planning for a summer/holiday time, book far in advance. The longer your stay, the more time you should allow. The DVC owner is the one to book/manage your res so everything is through him/her. He/she can book ME and/or a dining plan on your behalf.
Owners can book 11 months out at their home resort and 7 months out for any DVC resort.
On a points reservation, you don't get daily housekeeping so that is something to be aware of.
Longer stays eventually do and I think there is trash pick up after 4th day.
I always link and check me res in
MDE before sending payment but still that is no guarantee the owner can't screw you over. Maybe not intentionally but if they become jobless and are in default of their DVC loan or maintenance fees, they can still lose access to their ownership so it is a risk. If you are very risk-averse, just book through Disney directly.
ETA: Wow by the time I could get my answer typed out on the train, you got a much more thorough answer.
