Real VNC is a capable program.

The interface is easy to set up and works very well. It is able to connect in poor signal situations when the older tightvnc will not. Also, the encryption feature is good. The "offset from-your-finger pointer is OK for iPhone. But I would much prefer the "pointer under finger" mode for iPad.

My ipad remote keyboard does not work with ios9. Otherwise typing OK.

In Ios9, the screen never times out if RealVNC viewer is open. This runs the iPad battery down very quickly..
Also, the pointer following, but not being directly your finger on iPad is quite aggrivating.
Also, on my iPad at least, the three finger downward swipe required to cause VNC disconnect is unreliable. It may take 6 to 10 swipes to bring up the disconnect option.

But..Overall, it works OK..
..

w2jo about RealVNC Viewer: Remote Desktop, v2.4.2