Is my live sound setup good?

You should be able to make plenty of sound with that rig. It should do nicely for vocals and keyboard. Just don't try to run the bass and drums through it or will need an external amp and some bass bins. If you use both speakers at the same time you'll have plenty of headroom as far as wattage is concerned, of course you can damage any speaker if you turn it up too loud, overdrive the amp and cause it to clip. This is the only thing I would be concerned about. This will blow the horn drivers so just let your ears be the judge and if you hear distortion, turn it down.