I had Blockbuster and it was going well, until they jacked up their prices for exchanging the dvd's for in-store rentals. So i switched to Netflix about 6 months ago and I'm lovin it.
If you search google, you can find tons of coupon codes to get free movies out of those machines. I've probably only rented 5 movies from the box in my life, but never paid for a single one of them.
I signed up for blockbuster because of a $25 paypal promo. It took 4 months to get the payment. This was a promo direct from BB not an incentive based aff rebate site.
Been using BB since before they went online. It's okay but they are always tweaking their pricing plans and service because of poor management and the fact they are probably going down the tubes, but I have a few local stores nearby and my flicks comeon time, but I would say try them both then drop the other after 90 days