I'll actually comment on the device, instead of the singing. :)
So...the microphone has not one, but two cords? So your choice is between owning a larger, normal-style karaoke machine with a wireless mic, and this very-wired mic with no karaoke machine?
I think I'd rather go with the normal machine - it's a choice of whether I want another box in my electronics cabinet or be able to rock it out without tripping...
Anyone else?