I updated to the latest edition which includes the new Plato 4.5. I thought I would provide some feedback:
(1) Generally good. I especially like how you can drag a tab to the bottom of the screen to create twin views (like in Visual Studio).
(2) I got errors opening my existing project files. I had to build new project files to get rid of these. Not a big problem for me.
(3) Previously, I could tick 'show parameters in debugger' in SDBG and see all my parameters. Whereas this doesn't work now.
(4) SDBG still doesn't remember window positions between sessions.
(5) Like the coloured tabs.