Since you asked about warranty programs, let me tell you about my experience with IBM.
I had an A21m, that I bought factory refurbished (so it had a 1 year warranty). After about 6 months, it would randomly shut down. At first it would only do it every few days, then it got more frequent, so after a month, I could only use it for an hour.
I called tech support and waited on hold for 20....seconds. It was 11pm, though, so I figured they weren't busy. They told me to flash the bios, and do several other things that I knew wouldn't fix it, but I humored them. Then they told me to call them back if it happened again, and gave me a ticket number.
It didn't happen again until middle of the next afternoon. I called tech support again, and expected to wait on hold for a while, since it now was middle of the day. I dialed the number, and immediately got a person. I gave her the ticket number, and she asked if I had done all the stuff they asked me to. I said I had, and so she asked where to ship a return box to. I gave my address. The very next morning, I got a package from airborn. It was a box to ship my laptop back in. It had prepaid airborn overnight stickers inside, so all I had to do was put the laptop in and put the stickers on, and call airborn to schedule a pickup. They picked it up that afternoon, and IBM received it the next morning. They replaced the power card (I forget the official term) and sent it back to me same day, airborn overnight. I received the laptop 41 hours after it had left my hands, and only 81 hours after I first called them.
I've read several times where people sent their dell laptop in for service, and got it back a week and a half later.
Needless to say, I just bought another IBM laptop, this time, I purchased a 4 year warranty.