Need Urgent Advise on Bolt Cyclone Power Pack for Flash

Hi,

on BH photo there is a fantastic sale and i am not sure of this brand and want to ask if any one has used it can recommend or advise on that product Pls.

Bolt Cyclone Power Pack for Camera Flash
 
I have seen batt packs that look just like this one on ebay for around 125.00 usd ....I normally buy used Quantum's with chargers for real cheap and then just have a lock battery shop rebuild when necessary....but after seeing the ones on ebay I may be buying from china...as the ones I looked at connect thru the front of my SB900's like the Quantum Turbo does and that for me is a biggish deal to keep the batt door closed and out of harms way....
 
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