My first experience with the Jumpmaster in tournament setting was facing Dangaroo, before it got nerfed. Then I proceeded to face just about every single nasty Jumpmaster build and I just didn't enjoy them. (Mostly because they were taking me out behind the woodshed every time I fought them.) I tried to build a stress / Attani Mind Link / Slicer Tools list, but when I found out that there was no good reason not to switch my Gand Findsmen for Contracted Scouts the whole idea just lost all its appeal. Let's just say I had an emotional reaction to the Jumpmaster, I just didn't like them.
Now they are on their 3rd (or 4th) Nerf and I really think they did it this time. And now that I don't think they are comparable to other ships in power level, I am drawn to Dengar. If he turns out to still need another nerf, I will probably not be able to maintain my interest. But now he just seems good and fun.