There was a post previously on this exact same subject. Without going into it too much because I don\'t want to repeat myself, I basically stated that for a quick blast music creation package its good. However if your slightly serious about creating music and want more freedom than what this "lego type inserting samples premade" package offers you then you can download trackers and samples from the Internet for free.
I personally started on one of these lego type packages, namely Techno Maker and its add-on, on the PC. Highly addictive and no matter what music production skill you had your songs always sounded good. However I wanted to create my own riffs etc so eventually got into tracking. Never looked back since. I now unfortunatly share the sort of same elitist attitute as most music channel people have about people using these lego type software to create music. Although I would never say anything bad. So as a game and a good way to put some creative talent to use, i\'d say go for MTV. However if you want to create your own music enterily and of course can then consider it your own go for a free tracker.