Used ot be my favorite RDP; now broke in LM 17.3; not protocol selection and manual designation of such does not work.
The performance is great and it works well with the 5250 emulator I use on the XP client, which some other RDP clients don't.
Excellent remote desktop client. I use this to log into my XP box using rdp. Allows resizing of the main window so that you can still see what you are doing on your Mint desktop. Only one I've found that will do that. Very fast and responsive.
I use this daily to connect with a WindowsXP macxhine running UltraVNC. Krdc does this better than the Gnome client.