uTorrent is by far one of the best and faster Bit Torrent clients available and so it isn't any surprise that there's a portable version being maintained.
Compared to some other Bit Torrent clients, uTorrent is probably one of the leanest which leads to less crashes and lower use of system resources.
The client itself is quite easy-to-use and includes many requested features and bug fixes in each subsequent release, follow the popularity of the torrents themselves. With that said, uTorrent supports many popular features like privacy, RSS, bandwidth throttling, seeding limits, magnet links and more.
Version 184.108.40.206923 is a freeware program which does not have restrictions and it's free so it doesn't cost anything.
Virus and Malware Tests: The program has been tested with several antivirus applications and has tested clean of viruses, malware or trojans.