i only use /nin if i have to... i love using /sam the conserve/store tp bonus, meditate, sekanoki, i use macros with third eye and utsusemi that work with whichever sub i use. it really depends on what role you are playing if you are tanking or taking alot of magic or crit dmg then yes /nin is pretty much required. if just fighting normal mobs other subs can be more useful and less expensive on the tools... i say screw tools and just saber dance, haste/drain samba III and skillchain away.