Been lucky so far. I never watch two movies on the same day, so it works ok. If I watch a movie on Sat night and one on Sun night, I dont send them both back on Monday.
That makes no difference. With Netflix, I've found they prefer you to keep older releases longer and return newer releases faster. That keeps you in their good graces. Blockbuster is similar.
Blockbuster is miles aheads of Netflix in sending out new releases sooner. Netflix was the king of MONTHS long waits. I only have long waits with Blockbuster on HD DVD's. C'est la vie. Blockbuster is much better on mainstream Blu-Ray's. Netflix wins on indy film selections as well as their willingness to rent NC-17 movies. BB will only rent the unrated or R versions of NC-17 films.