Casio came sooooo close to a contender with the MZ, but they just didn't study their demograpgics well enough. It's too big, it's missing the mic features, and it's too much money for their "first" real entry into the higher end.
I'd watch closely, because if they learn from this experience .... they will surely put out a winner next time. Then Radio Shacks will be the hot spot to shop !
.......well, mabye THAT's a stretch.