If you can find a port buffer, the brass is reloadable without issue.
I used them on my 91's, and usually got 6-8 reloads out of the brass. A bit lower than my M1's, M1A's, which were usually in the 10-12 load range, but I think thats just due to the differences in the actions and how the guns work.
If you shoot around a lot of hard things (concrete walls floors/walks, benches, etc), all the auto loaders are susceptible to damaged cases, mostly the case mouths.
As was mentioned, the HK's and their clones usually send the brass into the next county, so damaged or not, depending on where youre shooting, just finding it can be more of an issue. The port buffers take some of that out of it, and tend to redirect the brass a bit more to the right, but you still have to go look for it, and usually a lot farther out than you think.