Here's the reason why i keep switching back to the old interface:
with the new interface the contacts list is hidden in a seperate tab so in order to make a connection with a client from my list i have to first press the button / tab to make my contacts visible and then double click the contact (so 1 extra click). However since at our company we also give support using quicksupport tool i also have to make connections by entering the teamviewer ID manually so in order to do that i have to press another tab again (again extra click) to be able to fill in the teamviewer ID. In other words i have to keep switching tabs whenever i either want to connect using contact list or when i want to manually connect using teamviewer id.
In the old interface the contact list and the way to make a manual connection using teamviewer ID is always visible and i don't have to do extra clicks on tabs to be able to switch between connecting using teamviewer id or directly using contact list.
I would switch to the new interface if this was not a problem.
And the solution can be fairly simple for the new ui. Either make some way to have contacts list always visible or put the manual connection using teamviewer id also on the contacts tab (without it adding the id it to the contacts list) so i don't have to keep making extra clicks to be able to make connections using both systems.
I don't understand how having to make extra clicks is considered a good ui upgrade