I first hear about Zombie Tramp at free comic book day and have been waiting for it to come out as a TPB. If you read the free comic book day printing you should know it has like nothing to do with the events in the TPB.
As for the comic, it's grindhouse. I enjoyed it but didn't feel that anyone's story was really gone into which is a shame because I think that it would have been great to learn more about the characters past the surface stuff. I really wanted more of a back story from Xula, and more of an explanation about the Rudolf family.
Bottom line if you like the grindhouse style you'd probably like this. If you want history and back story for your characters this will probably bug you. That being said I'll still read the next volume.