I used it when I first got the phone and it works good as far as conserving battery juice but it slows down the CPU performance and will have the phone run slightly choppy. If you're used to a phone that runs a bit slower than a GS3, you won't notice the difference bit it does move a lil slower with the power saving feature on as opposed to it off. Try both settings and see if its something you can deal with. GS3 with power save mode off still has the best battery life of any smartphone I've ever owned IMO