You want to copy off the DVD just so you can watch it at a later time and return the DVD on time.
As for the DVD/VCR combo. The more components a electronic device have, the more thing that can break or goes wrong. No, not highly rated but highly "over" rated.
There is a easier solution without the need to dub-DVD and skip this step all together.
Try netflix - You simply pay a small fee per month. $2.99/month and up. You pick and choose the movie that you want. Return it any time. Shipping time is usually 2 business day. DVD arrive with prepaid self address return envelope. It's like having a DVD Rental Store in your mailbox.
I have a different plan other than the $2.99 one. I get movie coming in each and every week. I don't ever have to be concern with late fees. I watched them anytime, return them anytime. Since they are coming in through USPS, they are protected but the U.S. Goverment. hahaha...