We have deployed the wyse 1200le's with great success.
You have to get an ftp server and you configure a .ini file that configures all your ica connections and customizes the terminal itself. You can lock it down, create connections, add a company standard wallpaper and push out firmware upgrades without a local tech present.
You just add 2 entries to your dhcp scope that points back to your ftp server and ftp directory. When the 1200le boots-up, it contact the ftp and pulls down the ini file. Works great!