Greetings,
I'll throw in my tire changer experience. I worked at the local Honda shop for many years, we used a "Coats" tire machine similar to the "Nomar" unit. That machine has changed thousands of tires and is still being used. When the shop was moved to another location we didn't bother to anchor it to the floor at the new shop to keep it semi portable, we mounted it on one end of a half sheet of heavy plywood. As long as you are standing on the plywood you can pull on the lever all you need.
At the new shop the boss decided to purchase a Harbor Freight air/electric tire machine (similar to the "Weaver" machine, links in previous posts). At the time it was about $1000usd, considering that the manual "Coats" machine was selling for $700usd at the time the Harbor Freight machine was quite a deal. Well its been there for more than 10 years now and has needed a few repairs (pedal valve and electric motor replacement), but considering that it gets the hell rammed out of it in almost daily commercial use it has proved to be a sound machine. It would certainly last Joe homeowner or a small shop a life time.
GB