I currently use TelspanRayo but considered DimDim because of the substantially lower pricing. One major flaw I found was the inability to share a custom portion

I currently use TelspanRayo but considered DimDim because of the substantially lower pricing. One major flaw I found was the inability to share a custom portion of your screen (as opposed to the whole desktop), so this was a no-go for my dual monitor setup. Additionally, the performance didn't seem up to par in terms of fluidity, mouse tracking, and overall speed. That being said, Telspan still has issues from time to time so I'm still looking for a viable alternative...