I'll start. Did you know you can run a headless version of JD2 on a raspberry pi? It's not the greatest thing in the world, but sometimes its nice to throw a bunch of links in there and go to sleep.
The download speed on any popular release will max out even the fastest connections. I assume the retention for less popular content is a lot better on trackers, but I don't have enough experience with usenet to say that for sure.