Bandit makes good chipper (which we use and believe in) and they probably make decent stump grinders.
But....
Looking at the picture of that model, it looks like the cutter wheel is powered by belts from the engine. A belt from the engine, then another belt to the cutter wheel.
I personally do not like this.
Why, because you really can't control the speed of the wheel. (people with direct drive machines argue when I say that, they say, "well I can throttle down and slow it down". Then there goes your power, you idiot).
You want a hydraulic motor to spin the wheel, not a "direct" drive from the engine. I don't care if the hydraulic motor drives a belt, that's just fine, just don't get that spinning motion directly from the engine's crank, that's all.
I like to be able to keep engine rpms at full throttle, but be able to have the cutter wheel moving slow in many situations; rocky ground, targets nearby, just grinding soil and surface roots, pea gravel around the stump....
Then turn the cutter wheel speed way up when I'm in the main stump and if there aren't targets nearby.
You sure you want a pull behind? The horsepower has been coming up so nicely in the self propel models, I think they are more desirable now. This is coming from a tow-behind owner.