Seen, fondled and played with about 4 or 5 and they are good, solid, brand spankin' new manufacture M48/M48A versions of the K98 (the bolt is a bit shorter and not all parts interchange with the K98s). The short barrelled versions are a buncha hooey - heavy on the recoil, really loud and you lose velocity from the short (18") barrel.
What you get with a collector grade is a really nice lookin' one but understand these are the M48/48A rifles that have no historical value as a WWII Nazi Mauser if that is what you are looking for.
If you are looking for a solid, accurate, totally reliable hard hitting brush gun they are a good choice, except for the terrible Mauser sights; or as mil-spec to turn into a sporter but then you are starting out on the high dollar side and could easily do as well or better with a new commercial bolt gun and it would probably cost you less than the overall conversion costs it would ential to make it a really nice sporter. JMHO. Mikey.