Cheap, yes. And light. But not always the best idea. Two examples spring to mind.
Case #1 - the hated vacuum cleaner
We have 100% wood floors in our house, with a few area rugs. We also have an upright vacuum cleaner that got good reviews on Consumer Reports. It works great on the area rugs we have (all three of them) and would be excellent on wall-to-wall, since it is self propelled on carpets. But since we have lots of wood surface to clean, and it is big and bulky and hard to maneuver, and quite possibly a danger for scratching the floors, I end up using the attachments quite often to clean the wood floors. The wand attaches via a plastic nub on the nozzle that interlocks into a slot on the accessory. A soft plastic nub. Which wore down to nothing approximately six months after the warranty ran out. So I end up having to bend over to hold the floor cleaning attachment at the midpoint junction so that it stays attached to the hose (sort of) and get a huge cramp in my hand and it still falls out every few minutes. And did I mention that all those plastic parts somehow did not prevent that vacuum from weighing about twenty five pounds? Fail, and Fail.
Case #2 - the rolling cooler that no longer rolls
The rolling cooler is, in theory, a great idea. We have a definite need for such a device. Our football parking area is a long way from where our friends host the tailgate party (they donate lots more dough than we do, thus the premium parking for them). We used to carry our big assed cooler in by PDM carrying it in his arms. It doesn't really have handles so you have to make do. Not fun. So for Christmas, I got us a large capacity rolling cooler. And it worked great, for about a quarter of a mile, on the first day we used it. Until one of the wheels fell off. Upon closer inspection, the problem was that the metal axle got very hot from friction and melted right through the fracking plastic housing that attached it to the bottom of the cooler. Bad design, fellas. It is not rocket science to figure out that the axle would heat up. So why use a plastic with a low melting point?!? Maybe they should have used whatever the suitcase companies use, because those rollers work fairly well. Probably because they aren't PLASTIC. What kind of rolling distance did they use in their design calculations? Ten feet? You don't need a rolling cooler if you park right next to the picnic table. I would have designed it for at least a mile.
Buyer beware. Look out for plastic. Because it is NOT looking out for you.