Is running DRUSH on a Windows 7 64 bit machine in a WAMP dev environment worth it? I've heard there are some speed and performance issues with this set up? Will I lose any functionality with this set up?
Try the dev version at Drush-on-Windows-Installer GitHub.
Some key functionality, such as remote sql-sync, is not working yet. You could also try running drush under Linux using a Virtual Machine on your Windows box.
i found this excellent tutorial over the net long time ago , http://vimeo.com/15371661 its a bit old & before drush windows installer came out . in this tutorial there is fine explanation how to install the drush with all the necessary components from the command line .
i hope you & others will find this useful.