I bought one of their pro vacuums when I had my lawn and landscape business. I used it for leaf cleanup. To be honest, it was a pain in the butt to use. It vacuums good, but the bag fills really fast. Then, you have to shut it down, unzip the outer bag, remove the inner bag, (Liner), tote it somewhere to dump, but inner bag in, zip up outer bag, and crank the machine back up. In one minute or so, you do the process all over again. I sold mine after just a few uses and was glad to be rid of it.
On stump grindings, I do not think it would work very well. Even in dry weather, I gat a lot of wet material from the stump area it seems. The machine does not like wet, damp, or clumping materials. I also get a lot dirt mixed with my grindings. The vacuum is not good at picking up heavy dirt particles.
The hose works only with very dry material. Anything damp will plug it in a hurry.
I suppose under ideal conditions, it could work ok. However, do not be fooled by that video. It is not as convenient to use as you might think. It was an expensive mistake for me.
Jeff