This one is a Chinese multibrand and is actually on the cheap side. Several sellers in France have it at different prices on our local Craig List. I don't know how it works and the quality.
The next on the price scale are about 3 time more expensive, coming from Italy or Holland.
Next level is around 7000$ with several makers like Rajo, RGO...
All are on the same basic concept : 2 wheels, a small engine, a rotor and that's it.
The drive is like a wheelbarrow, and no nostress, the feeding is hand made.
They can do quite a nice job if you have to cut out the firewood, even if that takes obviously more time than a big chipper. They are a dream for the tight access. Many times, I went through basements and service corridors with mine. Once, I went through an apartment in town, strange feeling.
After that, some are more sophisticated, just a little bigger but can still pass through a garden gate, same horsepower, with an hydraulic feeder, 2 driving wheels or even tracks. You need to add many grands to get that. Awesome (and expensive) little machines.