The fact that this post has made it to #2 despite the huge number of PM tools out there reveals two things:

(1) Project Management is painful and the existing providers still don't fully grasp what the market needs/wants

(2) Matterhorn must be doing something right to get over the noise, so kudos to your team! For me, it's your realization that not everyone manages their workflow in the same way, so being able to coordinate while giving people their personal preferences is really powerful. I wish I could see a demo!