I had a PTR-91 and liked it quite a bit. I did trade it though, for a FS2000, and I'm pretty happy with that trade too.
The PTR was a good shooter but it was very expensive to feed. Also, not the easiest thing to scope (any mount will sit high to clear the rear sight). I'd recommend getting the cherokee cheekpiece if you intend to use optics other than a RDS. The irons were some of the best I've ever used.
If you trade I'd also recommend sending the trigger to Bill Springfield for a tune-up.