I took the set (Ion set (see if I try to move THAT again!), 2 guitars, 3 mics) over to a friend's house last night, since her husband had expressed an interest in TB:RB (he had never played any version of a music game, she refused to play RB). Set up everything, walked him through the basics on the guitar, handed her a mic, and started them on easy/no-fail (I was on drums with a mic).
5 hours later they both had moved up to medium, and I told em that I had turned off no fail a couple hours earlier. Never got her to do anything BUT sing, but she did fantastic! (She didn't know John was saying "Shoot me" either). He had taken turns on the drums too and did a bit of harmonizing (he was singing along with the songs ANYWAYS, had to give him a mic!). We even branched out into RB and did a little REM.
OVerall, I'd say the odds are you just got another sale of TB:RB. Do I get a commission?