BitTorrent? They ought to callit BitTrickle. Most of the time it's agonizingly slow.
Depends what you're downloading... I get some amazing speeds if I start the downloading as soon as the file's been released. Couple thousand other users downloading at the same time really helps.
If I'm trying to download an older file and there's maybe 10 downloaders and 2 seeds, that takes forever.
I usually download at 100-200 kbps using Bit Torrent. I've had a few slow torrents, but only because there were three or four people connected.
I strongly advise people not to use this program to download movies. Your IP address is very easily traceable, and since you share what you download, you share the culpability.
I use Bit Torrent to download the most recent episodes of my favorite shows when I can't watch them. I'm not sure what the legality of this is, though.