Yes, that beige Breathe Easy looks like the U5252-XXX that I sent down the road the other day. At first, I thought my son-in-law hadn't flipped the switch on the floor nozzle to "tools" position and that was the cause of low suction. Then, when I did flip the switch, it gained a bit of suction but not much. Couldn't find any raging faults in it, such as a clog in the hose, etc. Possibly something on/in the impeller but it was quiet (contraindicating a problem of that sort), so I didn't feel like investigating. With few exceptions (like commercial vacs; newer Kirby), direct induction machines are "old skool" and are too difficult to sell, so I didn't want to waste much time on it. I've messed around with a few Elites (to give to indigent friends and relatives) and even these noisy crappers had good suction. Well, better than the Breathe Easy.
Re. the Kenmore Grab'N'Go. I've refurbed a few of these without problems. They've got the same filter as a number of other Kenmores, so not unique to this machine. They will clog at the 90 degree bend where the hose fitting attaches to the body of the machine. It's easily removeable, however, with finger pressure on two tabs. Problem is (as with so many bagless machines), people never take the filter out for cleaning of even the most cursory kind. High vacuum flow won't allow for clogging as easily; things get sucked through too quickly to become enlodged. Some buyers like the idea of this machine due to the folding handle, compact size, etc.
The Hoover competition, called the Fold-Away, is another story. I won't do those. Somebody gave me one of those, which I took a quick look at, cut the cord off and sent it away. Being that it came from a home with dogs and smokers, it didn't have a chance anyway. They suffer the same problem as the bagless Tempo.
In general, the design of the hose can have a bearing on clogging. The ribbed plastic hoses that are so common now tend to invite clogging, I feel. Also the diameter, of course. Take the bagged Windtunnels, for example. Large diameter hoses, terrific suction, rarely see one with a clogged hose.
