Very good torrent client. Don't forget to download the GTK2 themes package if you're on Windows (gtk2-themes-2009-09-07-ash.exe) because the default look is really ugly (not suprising though).

Strong points :

• Good community

• Accepts plugins to extend possibilities (you can code your own plugin)

• Able to add multiple torrents at the same time and apply the same options to every torrent.

• Auto label torrents by tracker when you add them

• Mass relocate folders and force recheck (useful if you have one folder per label and you want to force recheck all the torrents of said label)

• save folders depending on labels like µTorrent "append the torrent label", but with custom speed limitation per label

Downsides :

• Coded using Python and GTK+ so the UI is slower on Windows compared to qBittorent for example (Qt framework) although it's not dramatic at all, i've seen worse.

• I have a superior tracker error rate compared to other clients. Sometimes these errors stop your seeding torrents. Only client to do that so far.

EDIT : nope, after investigation only one tracker is causing problems and i could see the same problems in µTorrent. Not all the torrent clients report errors like Deluge, that's why i thought i had more problems.

All in all, since µTorrent starts to be bloated with ads thanks to Bittorrent company and since the original Dev doesn't take part in the development anymore from what i read, i'll keep Deluge as my main client.

You can also go the qBittorrent way if you want a simpler client. It's very close to µTorrent in terms of features but keep in mind that some private trackers don't like qBittorrent (banned in some places).

27/08/2012 EDIT : qBittorrent is now whitelisted on every tracker as far as i know.

[Edited by TDL, August 27]

Deluge runs fine on Linux, but its GUI seems slow and bug in Windows because Deluge is written in Python. I recommend using qBitTorrent on Windows; it runs visible smoothly.

There is no option to rename incomplete downloads as it e.g. in utorrent (.!ut).
Very inconvenient.

I have not had any speed issues, and the WebUI feature is fully functional and totally gorgeous. Additionally there is a Chrome plugin that allows you to add a torrent in one click from another computer! (really handy if you have it running on a server)

It has a very slow interface because of PyGTK in Windows. I had some trouble with the daemon and web interface. I like qBittorrent more, it's also open source, uses qT, which is much faster on Windows.

A very good alternative in linux for uTorrent's users in Windows