I have multiple RPi (1 + 2) and have had alot of good use in them, and still do.
However unfortunately they are not quite powerfull enough for usage as a bittorrent download client, only basic use.
I have a 50Mb/10Mb connection, and the download is very unstable (throttling between 1-5 MB/s), due to the shared network/usb chip on the PI I imagine. The same torrent files on PC is 6,2 MB/s stable.
I hope it is okay that I ask in here, if there are any good linux mini-pc alternatives, with very low power consumption (<3-4 watt), that can max out my ethernet connection (> 6 MB/s stable), when connected to external USB HDD (ext4 format).