I own MS rifles in 6.5, 7x57, 30-06, 9.3x62 and 458. In my opinion they are the greatest hunting rifle ever devised. I have harvested several deer with the 30-06 and a couple bears with the 9.3. because of the ultra slick action, I can cycle this rifle faster than any other bolt gun I own and I own a few. Archaic? No way. Inferior to the savage 99? Get serious. You can't go wrong with one of these rifles. They are very reliable, controlled feed, accurate, hold their value and they look super cool. The only problems are scope mounting on the split bridge receiver, thin stocks on some of the larger calibers and the bolt keeper spring.
If you absolutely have to mount a scope, I'd stick with an original Steyr mount instead of having someone drill holes all over the place. They look like they belong on the rifle and are quick detachable. Other options include a variety of flip up side mounts but they require inletting of the stock and holes drilled in the side of the receiver.
Due to the nature of the rotary magazine, a lot of material is cut out from the stock sometimes leaving very thin wood between the magazine and the trigger assembly. Some of the heavier calibers tended to split stocks at this location. I had my heavier rifles glass bedded and have had no problem with them. Neither of my 30-06 MS rifles have this problem.
Pre war MS rifles are equipped with a Mauser style wing safety. Later rifles retain this safety but have added a thumb safety on the right side of the receiver. When utilizing only the thumb safety, the bolt is not locked but held in place with only a small triangular retaining spring on the right side of the bolt. When utilizing only the thumb safety, I have already slung the rifle over my shoulder to walk through the woods only to find at my destination that the bolt slipped past the retaining spring and the super slick action opened merely under the force of gravity, ejecting a live round somewhere on the trail.
In spite of this, I stand by the statement that these are the greatest hunting rifles ever made. If you are lucky enough to have the opportunity, get one or two or three.