I've had my 322T AWD for 4 months and have used it quite a bit on some serious slopes in western NC. It's a side discharge model with a Briggs and Stratton engine. I've also used the flail mower to cut through oak, poplar, etc. saplings and some pretty tough blackberry briar and multiflora rose (my favorite enemy). Here's my take on the machine.
It climbs hills like a goat, but stay perpendicular. It's kinda narrow, especially when compared to my John Deere Gator which has a real wide track and go sideways along the slope easily. Of course the Gator doesn't mow the grass or chop up the briar, but I'm just letting you know that the Husky would be a lot more stable with a wider track.
Power is just fine for mowing grass around the yard and on gentle slopes. But using the flail while going uphill on steep slopes and chopping through 5' briar puts a real strain on the engine. Yeah, I know it's not a tractor with a bushhog, but I wanted to push it to its limits just to see what it could do. Downhill, though, the flail chews through the briar and mulches the stuff real good. I would love to have a bigger Kawasaki engine. (Who doesn't want more power though?)
The flail does a great job of chewing up grass, small saplings 1 1/2" in diameter, briar, etc. It does not do a great job with stones! My property seems to grow stones as well as the briar.
It takes a little while to get used to the steering. As others mentioned, it is not power assisted, so you really "feel the road" and could get a bit of an arm workout with bumpy, rutty property like mine. I've gotten a little too close the barbed wire fences and ripped my beautiful HUSQVARNA letters off the side of the machine (1st day). They are now sitting on my dresser as a reminder that you can easily slides sideways downhill.
Also, I wish the mower deck was wider, but I guess you can't have everything. My buddy has a John Deere zero turn with a 54" deck and busts my chops about my 48" cutting deck. But when he slides down the hill and loses control, he wishes he had the Husky.
The flail is great for getting around wooded areas where you can't conveniently bushhog with the tractor. But the 48" flail cost more than my 6' bushhog.