Who has experience with Dive Compressors

I know this is not the best section for this but I know all the players here so please humor me !! I am going to be doing a crap load of testing shooting and practicing this summer as well as maybe supporting a son and a friend with tank filling and I am seriously considering a bigger compressor. But because of that I have a few questions that play into the consideration.

#1 I have been lubing my F8 every 2 hours on the clock as recommended and when it needs to start filling big tanks instead of guppys that will be multiple times per fill, Are you doing this ?? or will it survive longer runs, I’d like to think I could turn it on a go away for longer periods of time if it were to stay as my primary machine and not babysit it so much. This would make it plausible, I don’t mind half lifeing o-rings if it will survive a good while at a time. Maybe not even a consideration due to speed, I’m not sure.

#2 On the dive compressors in the $3500 price range, is there a clear !! single choice like maybe Bauer Junior or Coltri or Nardi ??

#3 A good friend commented he does not fill tanks to the 4500 psi limit to save wear and increase life on his new dive compressor, do you think this is a consideration, I believe him but would like other opinions too, I am guessing he was advised of this buy the seller but I’ll ask. I want 4500 psi fills for sure !!

#4 Do these compressors take a lot of maintnance such that buying from a good dealer in ultra important ??

#5 Obvious question is there any deals out there ?? Who would you buy through ??

Thanks,
Doug…