Dan, I have a Viking 1hp, of the Hobart KA design, in my sink right now. This was produced before Viking contracted Insinkerator, a few years ago, to make them. So what I have is virtually identical to a KA WhamJammer models, only with a stronger motor.
They are fun. I love to cram it full to the point where the autreverse kicks to keep it from jamming. It is the best auatoreverse I have seen in a disposer. You almost don't even notice it stop and reverse, it happens so fast. There are few times I have had to use the Wham-Jam feature because it rarely ever jams.
The downside, it has a chamber smaller than most, on the non-batch feed model. It doesn't grind pork chop bones, watermelon rinds, or corn cobs nearly as fast as a series-wound GE. But it is still quite a good machine overall. And HEAVY, it's difficult to even lift it to mount it on the flange.
The real down side are pits, like peach pits, etc. They bounce around in the hopper and make noise forever, like in an Insinkerator. The GE series is the only disposer I ever had or any brand that rids of pits completely within seconds. With the Carbaloy cutter and the warp speed flywheel, it more or less slices things istantly rather than trying to grind, and wear hard items down, on a shredder ring.
Like Wes, I love the older Maytags, like the FC10 and FC20. They are much better than Insinkerators on pits and bones. It takes an act of Congress to jam an original Maytag! Quiet too. Nothing like them ever made.
Also like Wes, it's hard to beat an original Waste King by Universal (not the new Annaheim made stuff.) The Waste King gets my #2 vote, after Maytag, for the disposers that can do everything well and not create a lot of noise doing it. Just all arouund great machines.
The GE series is my utmost favorite BUT, I have a cheap stainless sink and with a series wound motor running at 8000 rpm, its like having a vacuum cleaner attached to the underside of your sink and the sheet metal resonates with it. So you a VERY loud coupled system!
When I had a heavy, heavy ceramic sink years ago, the series GE was ideal because there was so much mass the disposer couldn't vibrate it and it only sounded like a subdued vacuum cleaner, ha. The absolute fastest on chicken bones, pork chops bones and fruit pits.