I gave up on getting a F91, so I bought about 38 QQ packs hoping to get a GN-ARM Type E.
In the end, I couldn't exchange anything but Nataku, and I'm just missing 1 fcking Zaku Warrior!! (now that really makes me QQ Q_Q)
If I go for Nataku, I will have to spend a lot next time to try getting GN-ARM again, but 38 packs without a single Zaku Warrior (heard it's not that rare)...not sure if I should buy more for it Orz
P.S. not that Nataku sucks, but its effect can be blocked by V-Vaccine is kinda...blah
P.S. also got a BR red frame and AR Psyco, not that I really wanted them but ok...