yes people have been launched using music/mtv programmes. obviously its not as good sample and sound wise as fruity, cubase, reason etc but the best thing about the music/mtv programmes is that within 2/3 hours you can have a track made that sounds awesome! its so accessable. so easy.
i dont think i will ever stop using the music/mtv programmes simply because of this! ive enquired in the past about music technology/producing as a collage course before and told them i use music/mtv programmes and they took me very seriously.