NX is very useful. It has some painful quirks such as AltGr locking inside the NX client window. You have to focus outside of the NX window to "unlock" AltGr, which is their suggested workaround. _Every time_ you type a character using AltGr, you have to move your mouse out of the window. Sigh.
Also, the update NX claims to have released is not visible on their website. 3.4.0-10 is supposed to be out since the 15th of November, but it is nowhere to be seen.