I personally love the multi pads.. You can do so many different things with them in a performace.. Plus I too like being able to have all 4 playing at once.. My only gripe is the PSR-550 doesn't allow you to loop your user pads....
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.