Some things we noticed:

The program connects to the mainstream. This requires more bandwidth and no video settings are permitted (video resolution and quality) as we were used in previous version.
The way we must act to connect 4 cameras is quite tricky. First, someone must click one camera, then click "Open" to view that camera in one of the four windows. Then, for a second camera, he must first click on a second window, go back to the camera list, click that second camera and then click "Open" again.
You could use either i-VMS way (add a "+" symbol on each of the four windows to go directly to the camera list and when you select a camera, it automatically display on that window), or you can add a check button next to each camera to select before displaying all of them together.
Also, you can add a Group option where someone can predefine group of four cameras to display when he selects a group number.

That's for now.

Keep up the good work :)