Doe's anyone else think that steffan looks like a penis? (:
With that set aside, I like the convenience of making one of these. Also, I very much enjoy the reliability of firing at least one dart 100% of the time (according to your data). Shooting two darts is better than none!
I will have to give this a try.
Try cutting the tip of the dart, then filling it with hot glue. Should prevent some fish tailing and make for a straighter trajectory.
Welcome to the hobby!