My boy had a chance to fly one at the ocean shores festival a few weeks ago and liked it quite a bit, granted he is not a pro flyer but how many out there are? He liked it primarily because it doesn't pull much, compared to his 2.5 silver fox std. He says its not as "floppy" as his atm but floppyier" than his new wmprosul. Thing for me is the widowmaker pro will retain its value better than the challenger in the long run. What happens if you break a rod in the challenger, skyshark is widly available but the rods in the challenger could be more of a problem. There were others at the festival who had one and they all seemed to say good things about it. still, some wanted to tweak it here and there. Decisions, decisions,.The silver fox could become his backup std.