It's odd to me how this remote desktop choice goes back and forth between LMI and Windows RDP.
I use remote access pretty much like Neil is describing -- one doctor, one remote, no ancillary staff (so no additional logins at any one time.
I simply use Windows RDP. The client computer connects to my personal office machine through port forwarding by my office router (I'm sure that if I could ever make the internet connection feature of Small Business Server work, that it would be more flexible and secure -- but port forwarding works just fine for me).
As long as I have about a 1MB connection (up and down) at the client end -- whether wired or wireless or cell-- it works just fine. I can even use Dragon on the client, and it types into the office remote machine.
LMI is never as clear, and doesn't seem as fast as RDP -- it does have certain features, and I do have a commercial version for use at times.
I tried TeamViewer -- it is much clearer and faster than LMI, almost like RDP. But it is very expensive, at least up front. Maybe LMI will cost more in the long run, since you pay quarterly