The 110V units are not completely useless, as Achipmunk noted, but cycle time (you use up all the air in the receiver, and have to wait for the pump to slowly pressurize the tank.. SLOWLY)gets old quick.. and for painting or high CFM tools it makes a 10 minute job into an hour long one.
If you have one truck to work on, or more patience than money, the 110V units can work for you. I sandblasted some jeep parts with a Sears 110V unit and it took hours to do something that should have taken 30 minutes tops.
If you pick your tools right, you can also somewhat mitigate the low CFM/receiver size. If you paint, get a pressure pot system, ditto for sandblasting.. it will give the air you have more working time and they are much more adjustable.
Use electric tools vs air, other than saving weight air and electric tools do the same thing. But an air drill is much lighter than an electric one, but they both spin drill bits.
For the $250 you will spend on a 110V unit vs the $1000+ you will spend on a 'shop' sized 220V unit look into the future and ask if you have one 1 truck to work on, or plan on doing many more. For 1 truck, the 110v unit will get you by. I am on my 2 of 4 trucks... so I didn't want to sacrifice time and tool performance... I got things that need done now.
