Anker 4400 mah Extended battery thoughts

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http://forums.androidcentral.com – I am interested in buying this battery: Amazon.com: Anker 4400mAh Li-ion Battery For Galaxy SIII GT-I9300, Samsung Galaxy S3 T999(T-mobile )/ I747(AT&T )/ I535(Verizon)/R530( U.S. Cellular )/L710(Sprint)+ White Back Door, EB-L1G6LLU - With NFC/ Google Wallet: Cell Phones & Accessories and was wondering if anybody here has one or has used one because id like to get some feedback on whether its worth it :) (HowTos)