I've been using Deal Extreme's 2 and 3-mode clicky switches a while(SKU 5604 and 5660). As little as you pay for them, they really do work great and are very reliable in my experience.
But I'm not sure if they will wear out after, say, 5,000 clicks.
So have you ever had a DX switch fail under normal use (not abuse)?
If so, can you buy high quality switches that don't ever wear out?