the only issue with a diy'er using a impulse nailer jack is that the fuel cells go stale. they do have a shelf life.. if the gun sits in the garage for 6 months and they go to use it the gun will misfire which makes one think its the gun. 9 x out of 10 its the fuel cell and its dead.
plenty of contractors run into this issue when they stock up on large amounts of fuel cells so they have em. its part of the reason paslode started selling smaller packs of nails which come with 1 fuel cell