This notebook is a beast, and seems quite reasonable money in comparison to some sli high end notebooks like the Alienware 18.
Nice review, I particularly liked how you explained the comparatively low effect of sli due to CPU limitations in some games, when contrasting it against the strong performance advantage of sli with lower powered GPU's. Also thought your advice was spot on about sensibly buying a single GPU notebook & saving the money towards the next notebook.
One thing though, why do you guys continue to use Furmark to stress test your GPU's. It's completely unrepresentative of normal gaming use (it's a power virus effectively), so has no value, in fact it can be argued that running Furmark is detrimental - it can place unnecessary stress on GPU's and shorten GPU's life, so I don't think it's smart to give the impression to consumers that they should be running Furmark regularly to check their GPU's performance. I do like that you used Crysis 3 as a comparison though for showing any potential throttling. For future reviews why don't you scrap Furmark, and maybe just choose Crysis 3 as your throttling test (assuming that it's the most demanding real world case).