We've had a set of Porter Cable for at least 10 years. Drill, driver, reciprocating saw, circular saw, oscillating saw, flashlight, and I just bought a jigsaw to complete the set. Never a problem, and these tools get used pretty heavily for every sort of indoor and outdoor diy remodeling and projects. I try to take care of my tools, but these have been dropped, knocked over and left at every temperature and they still run like new.
Honestly I got the original combo set because they were affordable and at the time money was tight. I'm pretty impressed frankly. I don't know if they would hold up to heavy daily use, but for residential diy they're great.
For other stuff I have a Bosch orbital sander and air nailer, harbor freight miter saw, table saw, belt sander and 21 gal air compressor, and an old Craftsman corded drill that was my dad's. I'm a big fan of Cub Cadet lawn mowers and Stihl weedeaters (and other tools). Those things take some abuse and run forever.