Thought I'd quickly mention an upcoming update to our WinForms Skins/Themes...
With v15.1, we've enhanced the appearance of DevExpress skin/theme elements to better support high resolution screens. Skin elements now automatically adjust size and margins based upon current DPI settings. The best way to articluate the improvement in rendering is with a picture. As you can see from the comparison images below, we've improved things quite a bit for high-dpi use scenarios.