I find it much better for a much lower price and perfect quality: I do not put it 5 * for I am disappointed by the quality of the camera, the S1 was much better.
The screen is perfect: not too big (not need a tablet!) Nor too small, so easy to use Internet and especially with ultra-fast 4G, I really see the difference with the S1 who rowed for several months.
The calendar was much improved and is really very good, the push up email works perfectly, the battery is much more durable than the S1, which had trouble holding 48h.
It fits perfectly.
Moreover, I greatly appreciate the improvements such as the location of the call received, ie, the city of location.
Great value for money, I do not see the interest of a more expensive, more efficient, it is perfect for my use sms / internet / downloaded applications.
Kies finally walk perfectly as I have never succeeded with the S1: I can finally save everything without fear of crashes, often with the S1, which made me worry about losing all my data!
In short perfect for me, the only downside camera I retesterai to see.