Sony has been producing garbage computers lately, I had a Z model that needed to be sent back for screen and motherboard replacement twice within the 1st 4 months of use (I assume it's due to their lousy inverters and mbs), the computer was increasingly slow and prone to overheating after each repair, finally, the LCD cracked while I was simply opening the laptop lid. It's back at their shop simply because I might as well use the non-refundable extended warranty I stupidly went along with, but I don't expect to get a usable computer on its 3rd return. I can't even get answers as to exactly what is causing the problems. Probably because they can't say "well, it's because we're completely incompetent" .
I've since found several BBs with complaints regarding VAIO laptops, most dating from after I bought mine, so no wonder I had only found positive reviews...well, here's a proactive warning to prospective buyers: Don't bother with Sony.