Because apparently inferior materials the analog sticks and the two analog buttons L2 / R2 wear extremely quickly.
According to the statement from Sony: "[..] In the wear is normal wear [...]"
About 10h of gameplay the integrated battery pack allows the controller. The Bluetooth connection to the PS3 is very stable and has never demolished. A completely discharged battery can while playing via the supplied cable to charge within 2-3 hours.
Conclusion: Due to the quality of materials and the size I prefer from two stars and forgive three.