If you play patterns you should get a chain driven pedal, not a direct drive.
I bought demon drives and after 2 years I realize it doesn't suit what I do (patterns). I can jump on a chain driven pedal that I've never used before, play much better and enjoy it much more. You don't get enough feel or feedback from DD in my opinion.
Now I have to modify/sell my pedal.
They're definitely good training wheels but I think direct drive is quite possibly a fad and chain pedals will be around long after they're gone.
The first truely workable bass drum pedal, the Ludwig Speedking, is a direct drive pedal. It's still around today and pre-dates any of the modern chain driven pedals. I don't think direct drives are going anywhere in a hurry.
That said, I agree that direct drives offer a specific feel. They are not for everybody and the only way to know for sure is to get your feet on them.