Fantastic if you're on the road a lot,
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This review is from: Anker® 4400mAh Extended Battery with Dark Blue Cover for Samsung Galaxy S3 S III, GT-I9300, fits EB-L1G6LLU, with NFC/Google Wallet Compatibility [18-Month Warranty] (Electronics)
Bought this for a recent holiday where there would be days where there'd be no way of charging my phone. I also use my phone with a wifi digital camera, which hits the normal battery hard!
However, this little addition was amazing. Charged really fast (faster than my normal one), on regular usage I can get three days out of it and with the camera, I can get a good, full day of shooting (the normal battery dies after 4-5 hours)
All in all, so glad I got this. Without it, I would be missing so many memories from my vacation.