At least once a year. Probably more. But I have a ton of consoles and lots of additives for them. If something starts acting funny there's no way I'm gonna consider dropping fifty or more to replace when I can likely fix it myself. Never took apart a PlayStation controller though. They seem spongy enough to probably be annoying as mirage apparently found out. But I've taken apart multiple consoles as well as all the old controllers. Only taken apart third party Xbox stuff not official controllers. And had to clean some alcohol out of a Wii gamepad. But those are the most recent examples. Taken apart both PS3 and 360 though. But still mostly older generation stuff. Easy enough to fix them