I had an sg 13. It was useless on anything of substance.
That is an interesting contrast for "Ducati"'s efforts. In 2009 I took out a giant co-dominant red oak of 80 years growth split in half by ice. It's stump was nine feet diameter and took 13 hours of grinding, a very impressive job for that little machine. I wondered then how long it would have taken a US Praxis 13HP to do the job.
The Husky weighs 250 and chops up stumps very effectively. But two weeks ago it's cutter wheel axle snapped in two at the wheel weld. You should have heard the commotion it made! Four online Husqvarna dealers said NIS, special order yet
www.ereplacementparts.com in Utah had one! With frt it came to $305.00 and I got new pilot bearings for $37 apiece, making for a big expense but some weighty scrap metal. My reason for buying the self-propelled Beeline was the work required to push and pull the Husky up and down the slopes...they're everywhere and I tip the scale at a meager 165 pounds. I needed a backpack booster engine. LOL
Now the Beeline, at 13 HP, has a permanently sealed Hydro stat drive, electric starter, battery, electric clutch and bigger wheels and tires, more controls and cables all weighing in at 450 pounds with fuel. The cutter wheel on both machines looks interchangeable (made by Bluebird).
In the words of "Forest Gump" that's all I'm gonna say about that. Be safe out there and use sock warmers in yer boots.