I recently powered up my "old" (pre-unibody) mid-2007 vintage MacBook Pro 17" for the first time in awhile. It's been gathering dust in the corner ever since I got my new MBP a few months ago. Wow - what a difference. It's amazing how quickly I've gotten acclimated / accustomed to the "feel" of the new laptop. Everything about the unibody MBP just *feels* solid, durable, way more substantial and stiffer than my old one. The overall difference is not subtle.And don't get me started on the performance bump. Big honkin' Logic 9 sessions that literally would not run on the old MBP are barely cracking 30-40% on the proc meter with the new one. Incredible.
Great engineering, Apple - the new MBP is by far, *by far*, the best computer I've owned. Kudos.