I'm an artist, so when it comes to my creative output there's no way around quality control - you can't just fire up Photoshop or Illustrator without checking your work first! And that is exactly what CI does for me with its online portfolio software; giving me access to all of their tools at once makes sense because they are one in design philosophy (as far as we know).
The only downside about this program right now would be if you're looking into using CI solely out of curiosity rather than actual need/desire- but still worth mentioning here since other users will have different requirements from myself. As mentioned above though, portfolio management has been greatly simplified by being able to use them both simultaneously throughCI.- It allows easy collaboration between designers / artists who may not even live near eachother due to cost constraints etc., which was really important for us given our freelance clientele.