the only difference from the flyjumpers and projumps is the name on them, some companies have longer warranty than others, projumps is 28 days last i checked, other companies are longer, but they sell the same stilts. I don't know how much they like us talking about other brands on here, but they're more expensive, and you generally get what you pay for, so powerisers will cost you more, and last longer, same with 7's