I've had no problems either. If anything, they have been too polite...
The bigger problem I have found is a shocking ineptness with Windows. I've had several guys accidentally shut down the TV session, Firefox (even though they had to click on the extra warning for multiple tabs) and the Explorer window. Add to that a tendency to hover over and explore options in a vain attempt to find things, and it can be a time-consuming exercise in frustration. I just want to take the mouse and do it for them sometimes.
Oh, and guys. TeamViewer has a chat function. You ought to try using it on occasions and making it an interactive session.