The 3 services they told us we could use were Join.Me, WebEx, and GoToMeeting. Over the past several months we have discovered that Join.Me is the most useful of these 3 options. It has every function that we need to work with our clients and those functions all work in the free version of the software. There is a little bit of a delay between what is happening on your screen vs. our screen, but all in all it is our preferred method.
Another thing we really like about the service is that you are able to download the software and it puts an icon on your desktop. When you call in for support, you can simply click that icon and get the meeting going right away. Having fewer steps is always a favorable option from a phone support standpoint.
As always, check with your IT before deciding which sort of Remote Meeting you should use. Let them know that Join.Me is the easiest for the work we need to do, but if they have a different opinion on which should be used, we always defer to their judgment. But again, Join.Me has all of the features we need for the best price; free.