The 17" MacBook Pro is basically a supersized 15" with an Air no battery bottom, which is at the least aesthetically pleasing. But with no battery compartment there is now no way to easily change Ram or Hard drive. So have your #00 Phillips ready.
The unibody construction makes the machine feel much more compact when picking up and overall condenses the already thin casing. It does indeed feel heavier than any other MacBook model but that's to be expected from a 17" casing. The trackpad has also been updated to the same no physical button pad found in the other MacBook models and even though the 17" MacBook Pro is bigger the trackpad has not grown.