i have one... only used it a couple times so far i know on 4 amp it will charge my 7.2 1800 battery in 30 minutes.
mine doesn't have teh same exact "case" but the sticker and switches are all identical, only thing i dislike is it is 12V DC powered only. but at the same time i love that i can charge it off of my car battery, while I'm playing with my truck, and at home i have a battery charger that i can connect to it for power. and it was cheap. cheap is better sometimes so long as it will last.