In our track testing we have concluded that the IBs have more available power than GPs. That is the truth and never have I said that GP are not good. GP has a great product and reputation. It just happens that IB has come out with a different way of making cells that seem to provide more power. Even if the difference isn't a huge one there still is a difference.
IB and GP packs are available for all so maybe racers should try and get one pack of each and figure out what works best for them.