Used with the Screamer and the PowerBall, for my part c is the screamer 50 combo that I control the Z-5, an essential tool for handy allows you underfoot the 4 channels clean, crunch, lead and lo- hi-lead, there is the VSL, it helps to increase volume when we move to a rhythmic chorus for example, c is very convenient. The Z5 is very strong and beautiful, the cable is thin enough for cons, it must take care. Small in size to the z-5 mellera very well with your other effects pedals. The price of Z-5 is quite high for this style of gear, but it costs the price of two Z-4, so when we think it's worth it is not in doubt. Well I would do that choice c is Kler and net j aurra not really want to take my head with only one or two Z-4. Essential for live.