So my job is installing high pressure air systems for paintball and airsoft sites and everything Tommikka has said is bang on!
There's not much I can add to this other than my advice which would be get yourself a 300bar 12ltr tank and fill from that, your'll get more fills for your money than a 232bar and it will last forever unlike these cheap compressors from China! As a surface use mobile cylinder it's going to need a hydro test every 5 years which is going to cost you around £50 well looked after tanks rarely fail, as Tommikka said never leave them empty and NEVER leave the valve open.
Get yourself a decent filling whip with a gauge if your worried about over filling as the small gauges on the bottles are rarely accurate, 3000psi working pressure bottles are tested to roughly 4496psi plus as stated you have a high pressure burst disc so it's not going to explode.
Lastly and it's been said already never ever get oil anywhere near the fill nipple, I'm an ex-paintballer and was at both the events Tommikka mentioned, one was in a Millennium event in Germany and the Southampton event was a friend of mine, I was standing about 10 meters away when it happened and lost my hearing in one ear for nearly a week, the guy had to have his playing jersey surgically removed from his skin as it had fussed itself to him, he's lucky to be alive.
Ironically the team he played for was called '2 Hot for U'