DS-U65 another alternative for BP-U60
 

Does anyone have any experience with the Dynacore DS-U65 batteries?
It's an 'alternative' battery for the EX1(R) like the Swit S-8U62. It also has a DC cable like the Swit.
I used one yesterday and it lasted over 4 hours: I finished shooting before the battery run dry, so I can't say how long it will last. It says to be 65Wh (a bit more than de Sony BP-U60).

I'm curious if anyone has been using them for a longer period of time. Are they durable and reliable?