Charge & Go batteries are fully charged within 15 minutes, using proprietary Varta charger. Charging in other charger, it will take up to 15 hours. Charger supports both AA and AAA size. They can be charged at the same time. Charge & Go batteries can be recharged up to 1000 times.
After using various types of rechargeables for various devices, stumbled accross this one at the sellout in the local electronics shop.
Using batteries mostly for my head lamps and digital camera.
Charger is just about size that we may not call it bulky.
After 60 or so charging cycles, batteries still do charge in 15 minutes.
Overall, those batteries give good value for the money.
Next move, though, would be to the Duracell 2300 NiMH
(edit: have bought another rechargeables, but I still have 2 of Varta 15min charge and go, and using them to power my Petzl micro head lamp. Year and half after purchase, batteries are still in the tip-top condition)