jasset, 1.7.2 isn't on the check for updates function yet. Proximo, no. That was in place versions ago. This latest change is for local peer discovery.
The bugs left behind in older versions are enough reason alone. The number of times we've had people complain about issues in older releases that have been solved already has become too numerous to count.
Are you trying to bind traffic to a specific IP in the advanced settings? Having it send a specific hostname is ONLY needed when you are running your own tracker from the same connection you're downloading with. It is not necessary for an extremely large percentage of users.
http://utorrent.com/faq.php#What_is_ipfilter.dat.3F No safepeer No plugins Blocklist maintainers have proven themselves time and time again to be morons. Make your own blocklist out of the IP ranges you can CONFIRM send bad data. Don't trust other blocklists.