I only have experience with Jitsi.
Installing it isn't straightforward at all, specially since you need to
create an XMPP account (or any of the other choices offered at first, like
SIP and other stuff I'm supposed to know about as a new user).
Another small issue is that enabling remote control is done by a small
checkbox, rather hard to notice when you don't know much about computer
(exactly the kind of person I'm supposed to help remotely). It should be way
more obvious.
Other that this, it's really great. maybe a tiny bit slower than
Skype/Teamviewer, but really not by far in my experience. Oh, another small
issue is the keyboard input not being the same when connecting remotely on a
Mac for example. Probably the easiest way to solve it is to go and display
the on-screen keyboard for those specific but vital keys.
So yeah, a couple of hurdles, but it works really great.
It just needs a simpler user guide.
