Glenn, I agree--I've seen a couple of these in used-appliance shops and they have a VERY soft suspension; very easy to move the tub assembly back & forth. You would think that, like the GE Portable, it would be too soft for adequate balancing. But I think that while spring-and-rod suspension tends to make the machine vibrate more when it's up to speed, it also handles off-balance loads better than others, and they will NEVER walk. Definitely essential for those portables, and probably one of the reasons why the earlier 12-pound Kenmore portables had retracting casters! Another characteristic it shares with the GE Portable is that the tub sinks downward as it fills higher; push down on the agitator and you'll see what I mean.
Judging by the relatively small tub size, I'm willing to bet the capacity is the same as the Danby, but if you plan to use the two in conjunction, capacity wouldn't be an issue. I wonder if there's a way to connect two machines to the kitchen faucet simultaneously? Trust me; once you get used to washing in more than one machine at once, you'll never turn back!
I prefer the full-sized 24" Kenmores because they have a larger tub and can accept any type of BD Kenmore agitator, however, if I saw one of these at an estate sale I would grab it in a heartbeat! Would definitely be fun to play with.