BTZS Tubes are a huge step up from tray developing (though you'll still be tray fixing) and can be done mostly in the light. I will never tray develop again. You get 6 tubes and a large tray/tank you float the tubes in and rotate them with your fingertips. Works actually very well and much faster to handle than using the Jobo 4x5 reels (loading the reels fully - with 6 sheets per reel - is problematic for a lot of people)