I have Prusa i3 with E3D V6 0.4 nozzle and sometimes use 0.4 nozzle Volcano on my Eustathios. I can say that the quality as good and detailer is more rigid. I printed the same detail and having the same PLA with E3D V6 0.4mm on Prusa i3 and with E3D Volcano 0.4 nozzle on my Eustathios. I was easily broken by hand detail that was printed on Prusa i3 and it was is much more difficult break detail that was printed on my Eustathios.
My favorite Volcano nozzle is 0.8 mm. It goes good quality and printing speed. I experimented with 1mm and 1.2mm nozzles too but quality was bad and it was more ooze. You can use 1 mm and 1.2 mm nozzles if it is not required quality and required speed for drafts.