Loved Reason and my old maudio controller. Blew me away how solid their software ran on my underpowered computer.
I also like the way that the blocks method of arranging a song works.
Reason also has some serious shortcomings though like a very basic piano roll and, at least lately, very bad performance. I'm not sure what happened there because it used to be the most efficient DAW on my system by far but now it uses 2-3x the CPU that Logic or Live do, at least on my machine.