Pros When it worked it worked well.
Cons Poor support and craftsmanship. More problems than it is worth.
Summary I have waited almost 10 years to buy an Alienware and my wife just got me a brand new X51. First it takes over 35 days to receive the computer and they can not tell me why there is a delay in my purchase. The video card acts up on the first night, Tech support wants me to buy a HDMI cable to just troubleshoot the computer. Finally get the video to work on port 2. The keyboard doesn't light up, ...1 hour of Tech support and promised a new keyboard two weeks later I still haven't received it even though they promised me in writing next day service. Today the hard drive is no longer detected and I cant even boot the computer.
I hope you all have better luck with this company as for me I will never buy another Alienware pc
Pros Quite fast and worked well from my external hard drive including its internal HD.
Cons Quite hot air oozing out from this box casing!
Summary I seen better value for money products than this. But if one really like the slim design and alien branding, then go for it.
Pros Small in size
Relatively weak GPU (especially the GT545-Version)
Bad cooling at the price of slim design
Summary Considering that the i5/GT-545 Version is sold for ~900€ (in Europe), it's too expensive for what's inside. One could easily build a far more powerful barebone system for the same price (including a stylish aluminum case). When it comes to gaming performance, the X51's GPU is just not powerful enough for HD resolutions in many demanding current generation games.
Pros Most normal office work gets done without any problems.
Cons Too Hot. Heat dissipation alone is scary to keep this running for long.
Summary Not bad for what it is selling today. Best to fix an extra fan or changed to a more superior video card.
Pros Smokes the consoles with ease, runs everything I have thrown at it with Ultra High settings, temps run cooler than expected on CPU and GPU, Overall great buy if you don't wanna mess with building your own!
Cons WiFi card very erratic doesn't work half the time
Summary Great for the gamer that doesn't want to build own and can fit unit along side consoles. Runs better than expected. Contrary to belief easily upgradable for a new GPU or ram, especially when Nvidia comes with the 600 series mid range cards that don't suck alot of power just like the GTX555. Sure it costs more than building your own, but what product doesn't?