The dryer is Gas. It's thirty years old. Works like it did thirty years ago.
The vent,, that is the thing that can get a guy. The shorter and straighter it is, the better the dryer works.

I have one, found it difficult to use, difficult to lock down the wheel while removing/ mounting the tire.

MM:  I have a No-Mar changer for motorcycle tires......it works pretty well once you get the hang of it  Soft sport bike tires are a breeze - stiff tires like the Sport Touring tires are not bad once you learn that you have to use clamps to squeeze the tire and keep it in the drop center.  (The stiff tires keep pushing upward and make it really hard to get the bead to slide down in the drop center of the rim).

Lancer:  It appears the Harbor Freight and similar models need you to drill mounting holes and put a bolt in the wheel to keep it from rotating, and a centering cone to keep the rim centered.....and some form of Duck Foot to get the bead on/off.  Watch some YouTube videos of modifications that owners have done to their manual changers and you can see some of them make it look real easy after the improvements are done.

Since I hope to have a minimum of 30 motorcycle tire changes left in my riding career.....and likely that many car tires - it just seemed like a good investment.  I also hate driving to the dealers and leaving my cars or wheels for somebody to abuse my wheels.  I have a manual balancer for motorcycle tires that works well.  For cars and trailers I bought a vintage bubble balancer at an auction that works well - I know it is not as precise as a computer spin balancer....but I am going to see how well it works.

I am a bit sick - I just have a really hard time paying people to do stuff that I can do.