I owned it for 7 years before modifying it. I took it apart as I noticed it slowed down, and the reed valves in the head were obstructed with pieces of a plastic bag. When I first got it, before I opened up the inlet holes on the airfilter, I used it often without the air filter. Mistake.
Once I saw how simple it was made, I decided to improve it.
Most all of these compressors have a max run time and then a recommended duration of cool off period. They all would benefit from more heat removal. Usually when 12v compressors fail it is because they got too hot and melted the rubber/silicone cup on the piston which expands under the compression stroke.
My mods would lkely only marginally improve its speed to fill tires. The biggest improvement in this area would be thicker wire to the relay from the voltage source for less voltage drop. My unit says 13.5v max but I ignore that. Mine will get 14.7v at least at the powerpole before the units 14awg wire begins. Not sure how much voltage is lost on the length of original 14awg I kept.
Mine was bought for airing up 235/75 /15 tires mostly from 32PSI back upto 45PSI unless on soft sand then I might go lower. I have slightly larger tires now, 30x9.5x15, My rear helper spring Airbags go upto as high as 100PSI. Also my on Demand electric water pump cannot self prime, so I use the compressor to pressurize the 7 gallon reliance tank after filling it to prime the water pump.
I expect the unit will last longer simply because it cannot get as hot with the improved heat conduction and airflow over the head. I do have a more powerful 80MM fan Whose airflow I might concentrate on the head, but I have not really been airing down my tires as of late so it does not really have a chance to get hot so my need for further improvements are unwarranted.
The Only Mod that I did that I deem a requirement is the locking tire chuck as I so despised the thread on one provided with the unit. The Airflter's inlet holes being clogged with left over mold flashing should be opened up on purchase.
I've not really perused the newer compressor offerings. I've had the unit for 10 years now, and would buy it again unless something newer safter better was the same price.
I would not buy any unit with a 12v ciggy plug, Alligator clips, or no deal.
I think mine is actually marketed as MasterFlow MF-1050 Air Compressor, I bought mine in Pep boys in Nov 2007 for 62$ IIRc
https://www.amazon.com/Master-Flow-MF-1050-MasterFlow-Compressor/dp/B000L9AD2U