Just got my Epson 3100Z today. Still learning the camera's functions.
I'll post some pics once I take some worth posting...
My little review (after an hour of hands on):
The 3100Z is quite well built with quite good quality finish. One dislike is the piece of rubber that's used to cover the IO ports (like the Canons). Wonder why they do that?
The fast 2.0 lens makes a difference compared to my previous A40 2.8 lens. I took some indoor shots (with flourescent light) without flash and I think the results are better than that of the A40.
Taking night shots is pretty simple. Simply set it to AutoExposure, and that's it. Or you can set it to aperture or shutter priority or full manual.
The auto-focus is pretty fast. My 6 yr old son always had trouble getting focused pictures with the A40 because he never half-press for focusing. But with the 3100Z, the few pics he shot were focused.
The 3100Z is indeed bigger and heavier, but it's more of a pro rather than a con, well at least for me.
But one dislike about the 3100Z is its speed. It takes a bit of time to process (eg. when you want to view a pic). This slowness is very apparent on video clips.
By the way, you can take about 25 secs of video (320x240) with audio. There's a built-in speaker in the camera so you can hear audio when you play back the video clip.
Macro shots are also pretty good. It can be as close as 6 cm.
I'll play more with it and post some pics once I have some.