I've had my Sony laptop for just under 5 years now. Still no problems whatsoever. It's the only computer I use, and being in college, I use it heavily. Cost me $600 when I got it. 15in. i3 processor 4gb ram
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It does get very hot under load, which WILL lower its overall lifespan (sorry, having been in hardware for over 20 years, you cannot spin the laws of physics. Large quantities of heat lower electronics' lifespans, and 32nm technology is pretty delicate if not properly engineered. Proper engineering means you stay under 70C under full load, if you're going to do anything for any fair period of time.)
THANK YOU, for being one of the only people to acknowledge this. It seems like all the apple fan boys on this forum are completely oblivious to their own brainwashed minds. I read all the time "Oh your MBP is at 103 degrees Celsius? That's totally fine, it doesn't shut off till 105

so obviously it can't hurt your computer
Noobs
Computers are tools and articles of daily use - but many people here seem to treat them as pets or members of their family.
Not trying to bash you or anything, but my opinion is to the contrary. I completely treat my electronics like pets. Not in a weird way, but I treat them very well, and am careful (not just about nicks and stuff) with the way I handle them. I guess you could say I'm sympathetic to my tech. I don't repeatedly press the same button, I don't plug in a device, take it out real quick, then put it back in. I don't close the lid of my computer and lift it up to put it in my backpack even though it's not completely in sleep mode yet. I wait those extra seconds to make sure the computer processes, till it gets to sleep, till it registers the device, etc. I give my computer at least 30-45 seconds to load up processes after a boot up. Idk if it's just coincidence, but being gentle with devices, I've never once in my entire life had a device malfunction or break on me. Never had a speaker blow out, cell phone stop working, etc, in my 21 years of life. But maybe it's all coming down the pipe, lol.
Given how dramatically the performance of the computers changes within generations, longevity of a laptop is really the last question in my book. Old computers have their niche uses of course, but I wouldn't want to own a 3 years old laptop as my main computer.
I disagree with this. For those who use their computer to the max every day, where you would notice the maximum threshold of one generation's performance to the next, I can see this being true. But for everyone else, I don't think so. I just cleaned up my laptop with a new utility program, uninstalled a couple games I don't play anymore, and honestly my computer feels 90% as fast as it was when I first bought it many years ago. It's not a slow computer, so it's not a problem. Not sure if OSx gets bogged down, but cleaning out the OS may change your mind about these things. Lots of people just ignore it, or attribute the slowing of their computer to it's age and decaying hardware performance. Even on Mac, the system can develop quite a bit of clutter, and will slow down significantly.