Heh, many of mine were uh, "acquired" through the years... you know what they say about gear adrift...
I usually just stick to my p-mags, though now I think I'll get some new followers for the aluminum mags now while they're still cheap.
Here's something to demonstrate how a 30 round clip is useful in a home defense situation:
http://www.youtube.com/watch?v=DuhKCiY-lu0
The home owner was fortunate that the assailants retreated rather than engaging in a shootout, as he had nearly expended the rounds in his magazine by the time they drove away.