Depends on the model I guess? My Super Slim works flawlessly since 7 years.
The one I just picked up is the 2009 regular slim. For a "slim" model it's still a fair size, I'd forgotten how big they were haha.
My super slim didn't last long at all. Technically it still works fine, and the problem is very miniscule. Basically, anytime the fan kicks into high gear it makes a loud grinding noise. And I can't stress enough that when I say loud, I mean loud as fuck. Like... oh shit, the neighbors are going to call the cops, loud. I tried getting into the console but I don't think I have the tools or the patience.
Keep in mind, this only really happens when the fans rev up all the way, so I can use the console for Netflix and maybe a little bit of gaming, depending on what I'm playing. But since I do have another PS3 phat that's in working condition, I just opt to use that instead for gaming.
Oh, and it's just a 12GB super slim (yes, they did make 12GB PS3s briefly). I remember the day I found out that I couldn't install a 10 GB game because it needs to allocate about twice that amount of space to perform the install. That day has since been known as Christmas.