Thanks all for the input. Did these (behringer) ever fail on you? I'm worried that since it is cheap, it may not be reliable...

Again, I will use it for live performance of the tyros 4 and wireless mic system, and possibly another wired mic, connected to two powered 1k watt ev speakers.
Do you guys ever use effects for the tyros? If yes, can it REALLY make it sound better?

Shim