Just wanted to add to the above that I myself have successfully sent 10 DVDs and received 13 (I bought some Peerbux when I first started). Two of the DVDs I received were broken and I was credited for them and they were re-added to my DVDs I Want list. One of the DVDs did not come on time and a notice was sent to the sender to verify the send date. So far that DVD is only 2 days late so I will give it a few more days before I do anything else.
And to answer the impatient people, Peerflix is not exactly a replacement for Netflix, as you will almost always have to wait a bit before you get the DVDs you want. For the value, the wait time is worth it.