We tried the free version and decided that it didn't provide the QoS that WebEx did -- the video was VERY choppy. Because our product relies heavily on doing client presentations (we have a small number of large clients instead of a large number of small clients) we decided that it made us look less professional and made it more difficult to really show off all our bells and whistles to prospective clients than WebEx.

As I recall, we were promised better QoS if we purchased the paid version, but because we didn't have a way to see how that stacked up against WebEx without paying for it, we never tried it.