That's the grinder I've got for my Bobcat. I love it. Nice to have the loader, grapples, bucket and stump grinder all on the trailer at the job.
You do have to get the loader to the stump, which might be an issue.
It is nice to be able to grind stumps while sitting in the AC, listening to the radio, or talking on the phone.
Get the high flow hydraulics, I don't think standard flow would be worth a crap.
This grinder is supposed to be rated equal to about a 65 hp machine. I know it will eat up some huge stumps, and you just move the loader forward to shove the grindings out of your way. When you're done, just put the bucket on and scoop up the grindings. Beats the hell out of a wheelbarrow.