I am running the demo version of VEP 5 at the moment and I find it a really exciting piece of software.
One of my little gripes that I have found to dislike is the fact that when I press the button to show the GUI of the VST instrument in Cubase, the VEP server interface comes up. I really would prefer to have the actual VEP showing up instead of a generic window. I have paid a good amount of money to have an external controller for Cubase so that I can just press a button and the VSTi Gui to appear instantly on the screen. So if the server window comes up I have to click multiple times in order to have the VSTi interface show up.
Another consequence of this is that the VEP interface always disappears behind Cubase like it's a different app (maybe it is but...) so I cannot work with Cubase (editing) while I also have VEP in front of me.
Please let me know if there is an option for these things as I only demoed VEP 5 for two days and it is very possible I am missing something. For the time being, I am impressed, but these two things really put me off.