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Satisfied but not delighted
Overall it is a great computer. Some facts to keep in mind:
1) Windows Vista is nice but really slow, sometime it can be annoying, but I didn't install de XP that comes in a cd because I didn't want to mess up things.
2) Video memory is not as powerful us I expected. But it still works for some light applications.
3) The keyboard is not us nice us expected for this kind of product.
4) Brilliant processor, really fast, specially on 3D rendering.
5) Ram memory is enough for almost any task, what will keep your times down is video efficiency.
6) Screen is good. Size is good but not as light us expected.
7) Battery leakage is a problem if you are travelling and don't want to carry the AC adapter.

VGNSZ770N a mixed bag (XP Downgrade, Camera, Antenna, Battery)
I have had this laptop for a month, and these are my experiences: Upon opening, I attempted to use the included XP Downgrade disc, but it was faulty (apparently not an uncommon problem). While support sent me another disc, I used Vista and decided it was okay but not good enough. When the replacement XP downgrade disc arrived, it worked. The webcam didn't work though. Many frustrating calls and chat sessions (Sony chat support is better than phone support), they said I needed a fresh install. So I installed XP Downgrade again, and it still didn't work. As it turns out, several drivers were not working with a fresh install and they had to be downloaded from Sony. After that, the webcam works, though the framerate is not as high as on Vista (15fps on XP). XP is quite a bit faster than Vista on this computer (not surprising).

The antenna attached to the notebook is cheap and flimsy. In the hustle of the airport, I put the laptop back in my bag, and the antenna got caught on the side of my bag and is now bent. I wish there were a way to take it off as I don't need the WWAN.

The battery (like other users attest) loses power even if the whole system is turned off. This is annoying as I do not use my laptop every day during the summer (I am a student), opting for the convenience of my desktop quite often. Therefore, I have to worry about my battery much more than I did with my previous laptop, which was a Gateway. I'm not sure by how much it loses power as I have only recently realized it has this problem, but it's ~10% per day. I have not attempted to contact Sony regarding the battery due to other reviews which make it seem futile.

In the end, this laptop is pretty cool. It looks nice, runs fast, says Sony on it, the keys make a satisfying click for fun typing, the screen is pretty, etc. However, I wish it had a slot-load disc drive, more USB ports, a backlit keyboard, better battery which didn't drain even when powered off, and a sturdier and removable WWAN antenna.

Horrible Sony Service in USA
I bought this laptop 3 months ago. I have used at least 7 laptops from different brands. However, it is the first time I bought Sony laptop. The laptop itself is good, but Sony's service is extremely poor. I had my screen broken under warranty. I have no idea how come my screen broken. They didn't tell me they want to charge me first. After two weeks, they told me I will be charged $699. I have never met this sort of poor service. At least Apple and Fujitsu are by far better than Sony.
I have many research projects on my laptops. I have to wait 2 weeks, and then they just simply told me I have to be charged $699.
At that price, I can buy a totally new laptop. Not to mention that I can buy a totally new screen by $199.99 and replace it by myself.
I would recommend buyers before buying it, just think of it twice. Next time, if I wanna buy a laptop, service will be my first option, rather than performance, appearance, and brand.

Anything but a Sony
Over the last 25 years I have owned a lot of computers this one has to be the worse. Delivered with a cracked screen a number of functions have failed. Currently the audio and wireless network cards do not work. If you insist on buying a Sony, buy two and get the extended warranty. That way you always have a working computer.

Great Hardware Bad Operating System
What can I say, it's a Vaio and that is all that needs to be said. The hardware is excellent, runs like a race horse and feels great. I bought from Amazon instead of direct from Sony because Sony took too long and was a headache on payment. The only problem is the Operating System, Vista. The Vista OS is installed and no CD is provided. You have to make your own restore CD which there is no written instructions. And the Vista OS is terrible all round. I will put Linux on this puppy, only problem is wireless under Linux does not discover well.