The other thread on switching to (or expanding to) an AK has piqued my interest a little bit. I've never been a big fan of AK's just because; no real reason other than just because. But I have been thinking, if I did want to acquire an AK, I realize I really don't know much about them. I do recall some ancient threads about the quality of this brand or that brand, but I couldn't tell you anything more.
So, for those of us who don't know about these rifles, what should we know? For example, how do they operate, what are their quirks, and what are their maintenance requirements? If I wanted to purchase one, what features should I be looking for? For those of you who served (thank you, by the way) this thread might be akin to your introduction to your AR in basic training.