I bought one of the first-run Darts a couple of years ago. For what it did, it did it really well. Unfortunately, a super-glidey, understable mid was not something I needed in my bag. It was fun to throw on huge high glide-hyzer lines since it just floated out there forever but still came back nice and slow and predictable so long as you released it correctly. Now I just throw 4 Rocs for that shot.
I don't think that I ever putted with a Dart, but I have been throwing Aviars since I bought my second disc (first was a Raven), so I never really saw the need to try.