Same as the other posters. I have used DVC Rental Store and it's been easy. Only thing is to be prepared to rent at 11 months, and you will pay more for those points at DVC Rental than if you wait until the 7 month mark. I believe that policy is the same at most rental agencies. If you want to rent for a longer stay, it can be more challenging to find an owner who has enough points to book for you. Or you may have to do 2 separate reservations (if you want over 7 nights). That is why sometimes renting through an owner here on the DIS may be easier - but then they may not offer any refunds. And also, many rental companies make you pay for the entire stay up front (DVC Rental Store does not, but their points this year for the Poly at 11 months were $26 per point, on the high side). They do offer a partial credit if you have to cancel, as long as it is done within certain time frames. They now also offer insurance you can purchase from them when you rent, as well. Another small thing is you will not get daily housekeeping when renting points, so be prepared for that. You may have your room made up once if you are staying for a longer period of time. Daily room checks will happen. If you go the first 2 weeks of May, points are considerably lower. For instance, a resort view studio is 125 points for a week the first 2 weeks of May, so, at $26 a point from DVC Rental Store, it's about $465 a night. The last 2 weeks in May it's139 points for a resort view studio for 7 nights, so about $516 a night. You can find points for less, the rental companies are all going to be close in pricing. Again, a private renter will often rent for around $20 a point. As long as you have a plan and do some research, renting points can be a great option!
