I use the Patona next to orignalen "Olympus BLS-5" for my new Olympus PEN E-PL6; this camera is identical to the PEN E-PL5 (with extended / wertigerem inner life), so that the battery model can be used.
The Patona battery behaves, "felt", in practice, with the same use as the original battery from Olympus (display in the camera; charging time; endurance); "Felt" is because I mean Li-Ion batteries only up to about 75-80% loading and unloading in order to allow them the longest possible life.
Since both batteries only have a few charging, discharging behind, the long-term behavior -beider- batteries remains to be seen.
At the fair price of "bundle Star" came the very fast delivery.