I purchased a w520 just under a year ago. It did take a while to get. Approx 3 weeks, but I did customize it. I'm extremely happy about the purchase. I do remember a funky issue about 4 years ago with my address or something.

What kind of "issue" are you worried about? Microsoft doesn't help you? I had a HD failure with one about 4 years ago, and I didn't have any issues.