Overall a nice review. It's one of the few that shows comparisons to a desktop equivalent. I have an SLI-253 2QE model with many similarities that I've customized. The 980m's in the previous gens can OC slightly(+75/100 on the core, +300 on the memory) with very stable and noticeable results but the 980m's are considerably slower than these desktop version 980's.
One significant thing missing from this review are details involving the customization factors of the GT80 lines. The top covers come off with 2 screws giving you access to 4 m.2 slots(I have mine set up w/ 2 raids- 1 for OS , 1 for Games), optical drive bay(which can be replaced w/ another HD), and the standard HD, and 2 of the memory cards. The bottom cover has about 6 screws that give access to the remaining 2 memory cards, and GPU's. The GPU's are intended to be vendor only replaceable but you can do it yourself(warranty issues) .
It should be noteworthy that when the latest 10xx GPU's come out there should be a better power/performance ratio allowing more OC'ing on these both(the 980's use a different MXM than the 980m's).
The two things I completely agree about with all the GT80's: Price and displays. No word, but it would be nice if MSI puts out a 4k swap out(very, very unlikely). If you really want one and want to take some money off the tag. Buy a base model and upgrade the memory/drives yourself.