I had a Sony Vaio for a couple of weeks earlier this summer. It was one of their business class machines - BX something. It ran brutally hot and battery life was literally 45 minutes. I sent it back. Bought a MacBook Pro. Haven't looked back. I was immediately productive with the thing without loading a bit of new software, without installing virus protection, anti-spyware, disk defragmenter, TCP/IP optimizer, Bluetooth drivers, etc...
Oh, I forgot the best part, I can't run my favourite games on it so I'm way more productive.