I bought a Toshiba just over 4 years ago. At the time, I heard good things about them which is what influenced me to buy it. I didn't know about the overheating issue which did happen about a year after I got it. I was using it for an intense application, on a hot day and it wasn't ventilated as well as it could have been. When it crashed, I didn't know what happened to it.
Luckily, it came with a 3-year warranty so I got the motherboard replaced at no charge. Since then, it's been more susceptible to overheating (I wonder if it would have been that way had it not overheated that first time?) and got the m.b. replaced 2 more times under warranty. I've had no other problems with it and I certainly can't complain about the service. It's now out of warranty and will occasionally overheat so I just have to be careful about keeping it cool.
Interestingly, the owner of the service centre (authorized Toshiba dealer) told me that, if I remember correctly, 1/3 of the cost of my laptop was the warranty.