It’s the lens I’ve had for a few years and it works nicely. It is an old design though and newer lenses can have better resolving power, which will show on high Megapixel cameras. I’m quite happy with the lens and the results I get from my 20something camera. If ever I wanted higher resolution, I’d stitch a few shots.
If you want to buy a new macro lens, verify that it can get you the scale you need. Some lenses bear “Macro” and only go to 1:2 or even less. I strongly recommend to get a lens with a tripod collar. It helps making a stable scanning setup. Check out the following posts for inspiration.