None of the pfaff's I've used were new... no clue how old, one had spent some years in a large department store alterations department, and the other that comes to mind has been in with students for a little while. The alterations dept. one just felt off. It was a topic of much discussion around the shop, no one liked it. It was always a little loose, and I felt like you had to fight to get it to feed fabric and sew a straight line. It also looked like it could do something other than a straight stitch (there was a whole other tension wheel device on the side) but we were to busy discussing it's other issues to address that :-p.
I have a pfaff dometic serger which I've never really been enamored of, either. I think it's trying to do too many things, and isn't really good at any of them (it can convert to be 2-5 threads, some other fancy things, and a coverstitch).
I've gotten pretty picky about machines over the years, and can usually adjust them to my liking. Some machines and I just aren't meant to work together. I think if I ever were to purchase a new industrial, I'd go for a Juki. Not that I think I'll need to, I already have too many machines.