I did a search on the first part number and didn't find much info other than it's the model that came out about a year ago.

Configuration wise, the first model doesn't seem to be any different. Then I guess the difference comes from design and materials of the body?

Can anyone shed some light on this? In what area the newest model is better than the old one?

What do you guys think is the best way to find out?
I called tech support and they basically just read through the configurations,which I already know. They know little about other stuff.

Maybe I should check with the tech specialist in stores? Do you think they actually might have better clue with the evolution of the different models over the years?