I had a couple of Dragons, they were really easy to cock because of the very clever sliding pivot mechanism. Pinpoint accurate too but extraordinarily heavy!
My JB1 was much more manageable, just as accurate but a bit of a swine to cock if I'm being honest.
Never got my hands on a Sportsman, but that's the one that looks like the best prospect out of the batch of them.
I did worry about the complexity of the Dragon but fortunately never experienced any problems. The JB1 seemed a much simpler animal.