GP actually stands for Gold Peak, who trades worldwide as GPB or GPBatteries, .com in the US, .co.uk in the UK and .com.sg for their main offices.
The Powers range is just a branded Gold Peak cell, Power do not make cells.
The GP3300 is a high capacity cell with good voltage. Initial tests are showing .015 - .025 lower voltage than the current batches of HV's. The Internal Resistance is similar to the HV's and Panasonics.
We will be track testing them this week and until we have track tested them it's to early to tell if this cell will be any better or worse than the HV's which seems to be the cell to beat.