It's a good laptop, however it seems a tad pricey. It has an SSD, which is nice, but you'll only be able to fit programs and the OS on it, rather than games. You don't need 16GB of RAM for playing games and you won't need to anytime soon. I have 8GB and it is more than enough.
If he must get a laptop (for portability, etc.) this is a good laptop. However, $2000 seems too high, and if you built a desktop of the same price it would be ridiculously powerful in comparison. I built mine for about $1100 (US dollars), and it would outperform this laptop.
My final verdict is that the performance would be good. It seems to be a well-built laptop, but it is a bit thick, and from my knowledge the fan is also a bit loud. However, I think that configuration is worth about $1700 rather than the $2000 it's being sold for now.
There's
this laptop, which has the same processor, same amount of RAM, a bigger SSD (256GB!), bigger hard drive, better graphics, a Blu-ray burner, and a bigger screen, all for $300 less than the Alienware. I don't necessarily trust that site, but I'm just showing that I don't think that Alienware is worth it's price.
There is a building your own computer thread, but this isn't building your own computer, and the technology board doesn't get much traffic as is, so I don't see a problem