I had a Sony Vaio Z505 until I bought a new laptop last summer. It was a really sweet machine, fast and gorgeous. 😍
I think it was about four years in when it started shutting off spontaneously, though. I could probably get it fixed, but the problem isn't reliably reproducible, and also I was ready to get a newer, faster computer. But certainly for the length of the warranty period it was reliable, and always a gorgeous little machine. The only thing that sucks (imho) is Sony's insistence on using stupid memory sticks in everything instead of a more useful CF slot, say. Or maybe they've changed that; I haven't been looking at computers in the last year or so. Good luck with your decision!