I used the Artisan kit, now I have cubes of E-6 Fuji chemistry I got when Richmond Camera stopped developing film. I don't see much difference quality wise. Some reuse the Aristan stuff, I never did. Worked great in my Jobo, less steps. I mixed it up in smaller quantities, the longest I left it in the jobo bottles was about 2-3 weeks with no issue after mixing. Of course, I have a nitrogen tank so I give my developers a little shot before closing them up.