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They are always very loud, get hot, have ridiculous power draws even when idle.

Microstuttering in 3D applications means that you'll have to disable 1 card most of the time. They'll require different drivers for max performance which may get tedious.

If you're in the market for a laptop. You may get a much better deal on something with a single graphics card where noise, battery and heat (even performance) are concerned at a lower price.




Also a big 17.3 inch laptop may be a bad idea. Laptop screens generally don't have the best color representations and most aren't even IPS, having lame viewing angles.
Better to buy a laptop with a smaller screen and connect a larger one to it rather than having to carry around a behemoth that eats through it's battery in 2 hours anyway.

Laptops have a lot of disadvantages, even without SLI setup.
All the laptops I had were always at least 20% slower than desktops built on similar components while being much more expensive. This should already make you think twice before you buy a gaming laptop.
If you think you'll be able to enjoy gaming and travelling at the same time you're wrong. You'll face connection problems and slow internet in hotels and will need to find a decent chair enjoy gaming and desk to fit your mouse pad (can be harder than you might think).
Just buy a decent smartphone and play sims or something while you're away from your beloved PC. :D

I couldn't agree more.