I bought this charger as an alternative to the original charger, since I always had problems, these were my original battery's in Canon EOS 40D loaders never really crowded. The charge indicator of the Canon-loader indicates full, although as I stated then, the batteries are only 80% charged.
The Hahnel Twin V Pro loads the original batteries better and more accurate than the original loader this can. Both displays provide information per bay, as full or empty is a battery and how far is charging. The great thing is that you can load 2 batteries at the same time, also of different battery types. One exchanges there only the adapter plate. Unfortunately, always 2 identical types can be loaded because the adapter tray is not replaced individually for each bay. But you can thus its batteries quickly and efficiently load, without much time to lose, because the Canon charger you have to load them, which simply takes time.
The size can be folded easily and stow these handlers in the camera bag, if you drive times farther away. A car charger is included. So in short, an absolutely recommendable product, which full 5 star gets me.
