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The hicap winding mechanism uses a coiled spring connected to a cog/gear that pushes the BBs from the resevoir up through a tube to the top of the mag. I couldn't find a diagram or a picture of an opened hicap on Google, cause it would explain it so much better than words.
In terms of reliability, they are not as reliable as a well-oiled lowcap, and they also can't feed as fast. Most brands are definitely reliable enoungh for field use, for most people at least. If you've got a gun with a very high ROF, you may find that you'll be getting a lot of misfeeds and dry fires with a hicap, because it can't feed fast enough. Also, a number of people don't like hicaps, myself included, because reloading is fun and challenging. It's kinda lame to see a guy shoot a few hundred rounds at you without moving anything but his trigger finger.
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