Happy to say my experience with Zippy packs has been the opposite of Jestors, could be that IQ of 130 made the difference.
I fly them in my Phase 3 F16 and my foamy warbirds and after 2 years and many many flights they still all work fine. I must of been lucky cause I have over 15 of them and none has come DOA.
I can't wait to get my free Zippy after HK see's this post.
Honestly, any one who comes on here sprouting off about his IQ must have a real small one.[X(]