First, from what I have seen and researched, they are good machines, it won't let you down if you buy one. If you are very limited on shop space, this makes them even better.
The one drawback is that you do have to be smart about planning out your projects. For example, try to group all your table saw cuts together before switching it to another mode, like the drill press. I know they have done a lot to make the switches as quick as possible, but I could still see frustration that after taking down a setup and realizing you need to go back to it soon afterwards. Again, careful planning can be very helpful. The other is that some of the operations are a little different when compared to the stand alone counter parts. Not really a big deal, but a different way to look at it.