Roland Cube Street EX "50" watts is a bit of a stretch since 8 AA batteries, running for three sets, are only going to deliver ~12 wats RMS (8 x 1.5v x 1 amp)... I've not tried an S1, but its got to blow the Cube away given its much larger battery.
Roland gets that "50" by assuming no distortion and a 10x peak to average ratio for typical music (roughly 12 watts x 80% efficient switching power supply x 80% efficient class D power amp x 80% to power the preamp/effects x 10). But many individual instruments, can be "atypical" for long enough stretches to blow that assumption away. A 50 watt Marshall can cause near instant permanent hearing damage that no Cube is at risk of doing. But the Cube Street EX is plenty for many low volume gigs.
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