Installed 2.3.3 through Kies 2 days ago, here are some of my experiences I always update to the latest version when its available. 1. GPS working great. Locks in 15-30 seconds! Compared to before which sometimes never locked after several minutes. I always test from the same location and same method from outside my apartment window. 2. Wifi signal problem. 2.2 was weak, sometimes dropping the signal when i am at home 2.2.1 was very good, i can lock in to my wifi anywhere in my house and never dropping a signal for around 3 months. 2.3.3 seems to be back to 2.2, signal is weaker than 2.2.1. I used 'wifi analyzer' app to monitor. 3. Battery. Seems to be better. Better app management also, seems apps are gracefully killed when not used. 4. Apps. Several apps that was running before now FC immediately including Asphalt HD. Maybe need to do a factory reset? Some widgets are reset or lost, for example Weatherbug widget reset itself to new colors. Another widget showed "could not load widget". THis is happening not just after upgrade to 2.3.3 but also since new boot-ups. 5. UI. Nothing special. I was hoping for some new features. Does seem a bit faster 6. Touchwiz. Cannot find anythign new here. 7. Task manager. Before, the built-in task manager had 2 levels. level 1 never seems to do much. Level 2 was very effective in killing everything. Now it seems 2.3.3 has only level 1, and not effective in killing. Tried task killers and it seems more difficult to kill tasks now which is similar to 2.2.1. 8. Quadrant. Getter lower score than 2.2.1. I test immediately after bootup and 2.2.1 was 1050. 2.3.3 is 960. However no appreciable difference can be seen, ie no lag. How about you?