I have the PTR91 GI. Never had a jam, and plenty accurate. Great value for the money. When I bought mine a few years ago, factory new H&K mags were selling for four bucks a pop via military surplus sources. At that time I stocked up on them. Think I have thirty or so. Don't know if they're still that cheap, but likely close.
I have the same rifle, and same experience, no real issues to speak of. The magazines aren't quite as cheap now, but the sources are out there with deals well below what the AR-15 crowd is paying for mags.
You may get used stocks on yours, they will be probably be genuine HK, but used.
For a clone battle rifle, it's decent option.
Downside, if you ever need parts or want to upgrade, you are buying in the HK market and paying accordingly.
