I've had a Stinger shop vac for over 8 years now, and it's been virtually trouble-free. Only once did I have it suck up too big a lint wad that I had to take the whole thing apart to clear the clog. Ever since, I just use a crevice tool, it prevents anything oversize from getting in and jamming it up.
I bought a second one for my truck recently to use as a dedicated wet-vac, and it's been great too.
It's perfect size for my truck, has enough power to get the job done when cleaning condenser coils, inside dryer cabinets, vents, etc. I don't really like shopping at Home Depot, but they offer the Stinger for $30 which is by far the best deal I've been able to find for them. Amazon wants almost $60 for the same model!
Just thought I'd sing the praises of my Stinger, it's been reliable and an incredibly good deal for the $30 or so I spent for it years ago. And I use it nearly every day!