Honestly, I was torn over the upgrade from the S1 aluminum because I just didn't know if I'd feel like it was worth the money. I struggled with the purchase, but ultimately bit the bullet and just went for it. OMG I am SO glad I did! This watch is stunning. I LOVE the feel of it, and it is just beautiful. I have my turquoise sport band on it and it looks awesome! (I am going to order a nice link band for sure now that I have the stainless). My daughter is enjoying the aluminum, but I don't know if I'll ever own anything other than the SS; it definitely exceeded my expectations. And the battery life going from S1 to S2; it was 68% when it arrived Friday, and I put it on that afternoon, didn't charge it that night, wore it all day yesterday, didn't charge last night because the charger was in the guest room and my sister was asleep in there. It STILL had battery this morning! I stuck it on the charger this morning for an hour or so, took it off at 100% and have had it on nearly 6 hours and it's still over 90%. THAT is awesome!