The biggest drawback of 925 is the non-expandable 16GB memory. C'mon, when you have a phone that can take hi-res photos and videos why only 16GB memory( you can use one drive but what about music, videos and other content you want to access offline?)? I read in reviews that even the battery life is bad. These are two main factors why 925 is a flop among power users. If you want a device with better battery life, expandable storage, decent camera, newer OS and on-screen buttons - 635 hits every point. Also, I think dual-color rounded plastic shells looks much cooler than the boxy aluminium industrial design.