I DJ and to be honest with you I wouldn't touch it with a bargepole.
The speakers are listed as being 300 watts each but in reality the 300 watts is the total MAXIMUM output. RMS (the comfortable level the speakers will run at) is the real wattage so that will only be 150 watts per speaker.
The claim you could fill a venue of 150 people with this sound system is a complete and utter lie. It would sound like an ant farting in the royal albert hall lol.
Like I said I DJ so its a slightly different set up for me but for a room of 150 I would be using speakers doubke the waatage of these and also bass bins.
Best thing to do is do find an online musicians forum and ask the musicians on there what they would recommend. Personally speaking dont touch cheap bottom end of the market equipment because it will let you down.
Good luck ;-)