I have the 6 gal. one w/ steel tank, and my cousin has the same one with the aluminum tank. You are right on both counts of super quiet and I run mine 90#-120#, what it doesn't have is the recharging rate .You can't use pneumatic drills or sanders,grinders etc. not enough air capacity. Small brad nailers work fine, I use mine for blowing things off and brad nailing/ stapling.
If I was to do it again I would buy the aluminum tank ,It doesn't rust and is noticeably lighter weight.
I sure like the less noise level, I don't jump out of my socks everytime it turns on.
Hope this helps,
Herb