I'm considering getting one myself too.
How useful is that, depends on your needs. First, you'll have an option to do your own sensitometry, i.e. find real film speeds you get in your process, not just relying on averaged data from manufacturer recommendations or Internet sources.
You can find out difference in contrast between your vintage and modern lenses, and adjust development to get uniform look from both.
If you reuse stock developer, it might be useful for controlling exhaustion and calculating appropriate compensation ratios.
If you scan, you can find out just how much highlight density your scanner can get through, and how little shadow detail it can recognize, fine-tuning your process for that.
So it's about fine-tuning essentially. You can go pretty far with recommendations and visual inspection of results, but I feel am at the point where a bit of extra precision wouldn't hurt.