well, like Point - counter point (for those old enough to remember it) let me give you my 0.02 cents worth
YES, it is SO worth it. The big expense is the 512G flash SSD. Besides being more shock resistant, not subject to fragmentation, its blankty blankaty FAST! So many programs load twice as fast. (I am running windows in Parallels, a huge diff. in start up speed). Video editing SO much faster. That is a huge part of the cost. The rest is the lovely screen. When I picked mine up yesterday (Tuesday) opened it in the apple store, put it next to the current 15" MBP and there is a noticeable improvement including less glare.
One feature that is not mentioned, while the screen is 2880 x 1800 you get 5 different display resolutions that all are very sharp. For OLD eyes, you can go down to 1024 x 640 (OK, WAY TOO BIG) and when I am writing code, I want a lot of space, so bring it up to 1920 x 1200. The default is in the middle. Most other LCD screens have one "GOOD" resolution. To me, this is a HUGE feature!
The speakers are MUCH better than the ones on my previos MBP. and the fan is MUCH quieter (I play Second Life a lot and that heats up the computer so the fans are always at max!) Oh yea, the video card is noticably faster with Second Life. I am getting twice the FPS.
I am very happy with the jacks. Yes, if you need wired ethernet each day, it would be nice to have that built in, I guess ditto for video out, etc. but I dont mind buying the adapters when I need them (Yo Apple, I am waiting!). Ditto with the external DVD Drive. If I was living on an airplane and wanting to watch movies on each flight, thish would NOT be the laptop for me, but I figure I use a DVD maybe once every other month or so. (and since I have more than one mac, the remote DVD option works fine with me. Worked fine for years with the mac air!)
Bottom line, this very expensive computer seems very polished to me. If I was just not so impatient to wait 2-3 weeks to order one, I would have an extra 256G storage and 16G of ram! But I guess I can settle for this "entry Level" machine
bruce