Gulu, the Superhero is similar to the Jawz in weight, price, softness, and durability, but (in my experience) it flies better--the grip is more solid (doesn't get as slippery as the Jawz after several slobbery catches) and it goes further with the same throwing effort. You feel the difference especially in minidistance, for freestyle they're roughly the same.
If you had come to Tivoli yesterday afternoon you would have seen us playing with them--Lyra, Olivia and I had an impromptu training/playing session. Then Jana (Grega's friend) took the dogs for a two-hour walk around Tivoli and Roznik while I went to a meeting.
I'll be in Ljubljana again Wednesday afternoon/evening, but I don't know yet if frisbee is part of the plan--depends on Monika's schedule and homework load.