Well i'm pleased to say the batteries are now in production and shipping, and I have video'd the 6600mAh beast to give you an idea of what it's like compared to the standard battery, and how it looks on the Shift.
Together with the recent GPS enabling ROM, I have to say this has given my Shift a new lease of life, and I am (once again!) very very impressed with the quality of the battery. IMHO it's a must have for Shift owners!
Take a look (if you are that way inclined) and let me know your thoughts!