Jawbreaker has a cultish following because there's this element of luck when it comes to texture and handfeel. It can be blah and unresponsive sometimes, but if it is your lucky day you may hit gold you get that slightly gummy or "fuzzy" feel that makes you feel a bit of a weirdo for how much you want to stroke it ... or maybe that is just me?
Aaanyway, the Challenger feels just a little smaller than the main competition (aviar and P2) for this kind of straight glidey putter, which promotes the feeling of better angle control. It is indeed a very straight flyer, and I would not like to drive it off the tee if it was a beating in version in Jawbreaker, for fear of the uncontrollable wind-flip.
4 stars only for me because I actually like my putting putters on the stable side (Sinus, Harp, Jokeri, P2) for both wind resilience and shorter comebacks if I happen to whiff straight past the target. The Challenger is a domey glider so it will catch air if given the chance. On the other hand, if you have a nose-down style and want to have an easy to control putter that with glide enough for an easy feeling Circle 2 bid, then maybe this one is for you.