I use NIN and DNC rolls for soloing weakish stuff like the harder tier magian trial NMs. BLU roll is used quite frequently for tank party in abyssea. I like to put DNC and Tactician's roll on my party while idle or recovering from a wipe. Bolter's roll is a fun toy and great for claiming stuff, esp when stacked with movement speed and mazurka. The last time I used BST/PUP/DRG rolls was in the SMN party on odin and we stopped bringing a SMN party to Odin quite some time ago... I would not say they're worth getting if you're short on gil. If you could only pick 6 rolls I think your best bet would be SAM DRK WAR SMN BLM BLU but rolls are probably situational based on what role you're playing and I'm mostly a tank party COR.

Also as a RNG I prefer SAM + DRK to Courser's... I'd prefer to have variable bonuses that don't randomly change how often I can fire.