My machine is a CF741, so I've got the shaper/saw combo, as well as a planer/jointer sharing the same space. I like that the shaper is easily available, and is a beast of a machine on its own. I like that the power feeder for it also is usable on the saw and jointer (awesome for face jointing). I like that I can just lower the cutter into the table and keep something common set up at all times.
What I don't like is having to set up the shaper fence every time I want to use it, so make sure you mill everything at once because resetting for that one door stile you forgot, sucks.
If I was building cabinets full time, I'd want a couple dedicated shapers. As I do one off stuff, a saw/shaper is perfectly adequate for my needs, as long as I plan appropriately.