Polyquest Twenty Five 6000mAh

Hello,

Does anyone have an opinion on the "new" 25c Polyquest 6000mAh LiPo's?
I just saw them on the HobbyLobby site (http://www.hobby-lobby.com/polyquest.htm).

I'm running two 4900's to make one 4s pack now and I just don't have enough runtime to make a 15 minute main with warm up and really going for it. I'm thinking that with that extra 1100mAh I just may make it but I've not read much on Polyquest.

Thanks.

DM