I got my trike in April, but did not start riding it until June. Having been riding an hour or two a day.
Is it fast? It can be if I push the pedals fast enough. Do you really care if your average speed is 17 mph rather than a brisk 15 mph? Only you can answer those questions.
To me, the trike is the perfect marriage of sightseeing, fun, and exercise. Its superior aerodynamics gives it an advantage over DF's going downhill and into headwinds.
It is able to give me what I want out of a ride, whether it is a training run, or a leisurely ride through our small downtown.
I will always have a trike; can't imagine ever giving up on it.
Plus, the trikers I have met are the most helpful, supportive folks I've known.
Trike on!!