The shop recommended that he purchase his own impact for daily tasks such as tire rotations. I am looking for a "best value" recommendation for a 1/2" impact that is of reasonable cost and one that would last a long time, assuming that it is taken care of.
FIRST, if the main use is "Tire work",
buy one with an extended anvil, and a couple of "flip sockets", one in SAE and one in Metric.
SECOND, if the main use is "Tire work", you do not need a 1/2" impact.
A quality 3/8 is ENTIRELY powerful enough, especially for a beginner. A high-powered 1/2" impact will tear the lug studs right out of the hub in a moment of carelessness. (I don't suppose he'll work on many Mopars with reverse-thread lug nuts on one side...)
I started my career with borrowed and VERY "used" impact tools. The first one I actually bought--used, from my employer that specialized in Tires, Batteries, Accessories (TBA) and fluid changes, was a CP734, but with the 2" extra long anvil, and a CP flip socket in SAE sizes. The '734 was pretty-much the "Industry Standard" back then. The thing would be considered a cripple compared to today's powerful impact wrenches. CP says 310 working foot-pounds of torque for the current version; and that's on-par with the better 3/8" wrenches now. I don't think CP offers an extended anvil on the 734 any more, but they do with the CP749-2 and probably others. IR will have something competitive.
https://www.cp.com/en-us/tools/products/impactwrenches/cp749-2
https://www.amazon.com/dp/B0054R6M6A/?tag=atomicindus08-20
https://www.amazon.com/dp/B004EYJYTQ/?tag=atomicindus08-20
Flip sockets (Most come with an impact extension, some don't.)
https://www.amazon.com/dp/B0002SR38M/?tag=atomicindus08-20
https://www.amazon.com/dp/B000LQG35O/?tag=atomicindus08-20
When I was looking for a new "Tire work" impact about a year or two ago, I bought a 3/8" drive tool with a 1/2" anvil, ("Compact 1/2") packaged as a kit with a couple of flip sockets. Light weight, easy to handle, doesn't take a lot of air to run, and has MORE than enough power to do 80% of what I need.
Look in the pawn shops, first, especially if you're NOT getting an impact with an extended anvil. Air impacts seem to be a popular item in pawn shops, and they tend to be reliable. Almost all of my impacts have been bought used. I wouldn't buy a used air ratchet, but I've had no problem with used air impact wrenches.
Better to have a used Snap-On or other "quality" tool than brand-new Bottom-Feeder Chinese ****. I have a mild preference for an oil-lubed impact mechanism rather than "greased", but there's good tools with either design.
If you buy an impact wrench that lubes the impact mechanism with grease, you'll have to buy the specialized taper-tip grease gun to use with it, and tubes of grease.
Some of the older "oil lubed mechanism" impacts had a pipe thread drain plug, pull the plug, dump the oil every couple of years. The newer ones "omit" the drain plug 'cause it saves fifteen cents.
Tell him to be sure to oil the air inlet (for the air motor, not for the impact mechanism) it every day. Do not trust "The Company's" inline oiler until he's seen the reservoir get refilled a couple times. Often the in-line oilers plug up and don't put any oil into the air supply, so the air motor gets zero lube.
Make sure he NEVER uses a "chrome" socket or extension (and especially a "chrome" universal joint/swivel socket) on an impact wrench.
He's going to need a torque wrench to put the wheels back on. 
. The 2235 is a real beast but probably overkill and around $300