Renting points is a fantastic way to experience the deluxe resorts for roughly half the cost that Disney charges. We rented points last year for the first time and enjoyed five nights at the Beach Club Villas.
The drawback is that it's a private transaction and you have to trust the person you're dealing with. The whole reservation must be setup by the owner - DVC will not speak to you, the renter. You can also add the dining plan and Magical Express, but again, the DVC owner must arrange them on your behalf. We were very fortunate to find an owner (through these boards) who took the time to answer all of our questions before we paid. There's no way to tell for sure who you're dealing with, but owners who have rented before should be able to provide references.
I'd also recommend researching the DVC point system and types of accommodations if you're not familiar. For example, the cost can vary a lot depending on the type of room (studio/1-bedroom/2-bedroom), the season, and especially the day of the week. By far the least expensive way to rent DVC points is 5 weeknights - Sunday to Thursday night. Weekends (Fri/Sat nights) are almost twice as expensive! (However, I've read that DVC is changing the point costs next year so that the difference between weekdays and weekends is smaller). You'll also find that certain resorts are in higher demand are harder to get reservations for, like BCV, BWV, VWL. So if you're looking for one of these, you might have to start looking further in advance.
Good luck!