I downloaded the free GSam version, and it is great. I may consider purchasing the full version in the close future.
I'm glad it makes not difference on Shutdown and Sleep.
I am concerned about in your reply is a full charge takes 6 hours and with that you get 6 hours of use!? I was under the impression a full charge gave you at least 11hrs of play time. 6 hours isn't alot at all.