Here is my set up, J2.4 with VZW Radio: Battery life is amazing, im writing this post with my Diamond on 4 bars of juice, I unplugged it this morning around 11 with moderate use. As for speed and memory, I usually have 125 to 130mb's of space remaining. Which is about 37 to 38 percent being used. As for performance this thing flys, never lags, and I usually multi-task with the Opera web browser and BeeJive IM.
So there ya go.
