Actually you'd be supprized.
Generally with many things in the past it was true , but here's the deal .
Buy the tool for the job at hand even get the extended warrentee , they are good for it believe me,. Use the tool ,take care of it proper oiling and dry air pressures and nails. If you have finished the job successfully and are putting things away..
Any air tool no matter how much you pay for it is susseptible to water from the compressed air , so when you put it away make sure it is dry inside ,and stays dry. and oiled . water lifts oil away. I've done repairs on all kinds of tools. Air nailers do not like to be dry fired played with. part of their longjevity is the drivin of the nail . dead bottoming out is the killer.
A little advise on air ,
Fillters put on the tank is a waste of time and investment . Compressed air loosess it's moisture as it cools, either by refridgeration or by the drop in pressure. I've let the air out of tanks with large vaklves and watched ice bullets fly out being formed right at the tip of the valve .
Minimal effeciency, put a 20' hose from the tank to the filter, then your working line. "The more oppurtunity you provide the air to cool in the line the more water you will harvest out of the air. simple as that.
Humidity levels in your area change so will the water in the line, coastal area are the worst.
I do not like automatic stuff , it often fails , and if you are not in the habbit of checking things , bigger dissappointments are ahead. All of my air tools still work very well . I have both expensive IR and cheap HF , both have their place . As far as nailers go harbor freight has he best price on nails if it the size you need , Nails are NOT genaric, Just keep that in mind choosing a gun.