Since I am always in borrow mode (currently -222 points from '09), let me tell you my experience. Several years ago, I made a ressie for Easter week/February break, whatever (a prime week off from school). We then bought our MD home and decided it would be better financially if we went to MD instead of Disney, so I rented the week on the rent/trade board. The girl who rented sent me a check which I cashed, then I called MS to put her name on the ressie. I was told that because borrowing was a final transaction, I could not rent my points. I had to refund the girl her $2100 and we wound up going ourselves. Borrowing can be risky. Luckily that was the only time we wanted/needed to cancel borrowed points.