I have to disagree about the Husky waist strap; it does take the load off your shoulders. I do cinch mine up, the same way I would on any backpack, but you don't have to if you prefer to have the weight on your shoulders. Now if you were saying that about the chest strap I could see, but the fact is that you can use that to take some of the load too, although most users would probably keep it fairly loose. It's really a pretty comfortable harness system and I have never wished it had thicker padding or anything. I'd say they got it right. Have you ever actually worn and used one?
The fact remains that the Husky easily outperforms the 770 and I find it comfortable. Yeah, by time I've burned a tank full (about 1.25 to 1.5 hours) I'm ready to take it off, but that's the case with any blower or trail backpack I've carried, and I've carried them a good bit (I'm a 3,000+ miler).