Stroke, thanks for your posts. Both kites can do tricks. I was watching videos of recently created freestyling an tricks with kites and my father used to do something like it with his kites. The Marlin is a heavy kite though, if I remember correctly, and has a larger wingspan than the Tracker.
As to who sold the kites: he bought the Tracker from a store called Go Fly A Kite in Manhattan (NYC), which closed in 2010. He got the Marlin from the two brothers who used to (still do? I'm not sure) own a shop called Caught in a Tree (out in Long Island, NY). They recommended the kite, which was made for advanced fliers, to him after seeing him fly on Jones Beach. My father used to have amazing skill and when we were in the parks he used to draw crowds. They were right to recommend such an advanced kite to someone like my father.
John, thanks so much for those pictures. That Merlin is not the Marlin my father has, but the Tracker does look similar. I will try and convince him to let me take pictures of his kites, but being the hovering helicopter parent of them that he is, and not being knowledgeable of computers, I might need to convince him that I'm not gonna sell them, first. He's more protective of them than he is of me, his only child!