Drush on Windows 7 and WAMP 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.