I am using Stardock Curtains with the version 1.1 BETA. In most cases, it is working without problems – with exception of the transparency effects (if selected). And I can confirm that the performance has increased as announced by Stardock.
I tested and modified different styles, especially „Crystal“ by Stardock in order to apply the gradient and transparency effects. During my testing I have modified both the colors and the text alignment within the main program windows title bars from left to centered (please the see the setting for the centered task bar text in the following screenshot – sorry for the German language…).

In this regard, I have experienced that the centric title bar text is not centered correctly in the middle of the title bar of Windows 10 main program windows. On the other side, I have also experienced that the title bar text of the child windows or dialog windows is as opposed to this correctly centered. Please see the following screenshots.
1. Examples for not correcty centered title bar text (main program window):


2. Examples for correcty centered title bar text (child or dialog window):

