12ltr 300bar gives me about 4 good fills before it drops off, the i get about 6 2000psi fill from there on,if a couple of you are getting one i would go for two. One 232bar and one 300 bar, the way to use them is u all fill from the 232bar first giving you the bulk fill then top up from the 300bar that way you are not losing all the higher presure from the 300bar from filling your bottles from scratch. We work that way and we get better fills and it last longer.
Like they have said 300bar tanks are like rocking horse sh#t, but these sell quick aswell, we paid £120 for our 300bar and £75 for our 232bar.
Hope this helps