I am on a free 3 months DVD rental, so not any problem for me who pays nothing!
The first month went smooth. When I send them DVDs, they receive them on following day, and dispatch a new DVD on the same day, which I receive the day after. No problem!
But now, it is the third week that every time they receive my DVDs, they delay the dispatching of new DVD to the next working day [Mon-Fri]! So in practice, I am losing out one day on every rental!