Need Urgent Advise on Bolt Cyclone Power Pack for Flash


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 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....