I haven't shot mine in a while but the results can be anywhere from bizzare to good depending on your idea of good. It sometimes resembles a lensbaby because in mine there is light fall off all around the edge and it's soft. Here are a couple of links to my blog where I posted some holga shots...

Does Mpix process roll film??? I've got a Holga and a bunch of DIANA cameras that I haven't used in years.