I don't know the model number, and don't care to look them up.
I have the V28 version of the one that looks like a toolbox. It works great - it really is a mini shop vac. I use it in the boat, in cars, and anywhere I don't want to drag a full size shop vac. It's doesn't have the suction of a full size shop vac, but it's pretty good. It also has the limitation of the smaller hose.
I've heard the 18v version works as good.
The 18V version is outstanding. Just earlier I used it to clean up some rice I spilled in the kitchen, and yesterday I shampooed some floor mats with it. It makes cleaning cars so much easier.
I'm sure the 28 does a better job, but of course these are more about what kind of batteries you have on hand.
It's now my favorite wet/dry vacuum. There are a couple of things that could be improved, but they aren't problem areas; just places that allow the thing to be more affordable. Overall it's close to a flawless design.
Easy as hell to clean, too, and while not
notably quiet, the sound it makes is easy listening. Still a lot more quiet than the roll-about units, though.
Not sure about the hand vacuums, but I might pick one up eventually. Something like that is never going to be as powerful as other designs, but the point of a cordless, hand-held, "Dust-Buster" style vacuum in the first place was always to be convenient; not super powerful.
Now, I don't own one of the hand vacuums, but I might at some point. If I do buy one I'll be expecting the performance of a simple "Dust-Buster", but with the convenience and run-time of a power tool battery.