Same here… Just upgraded and installed C13.0.10 Pro yesterday. Following what I have seen here and there, in the forum and UI related, I absolutely love this :
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The new Channel strip, on the left of the inspector in the arrange view, as it allow us to have a direct access to the ‘Pre’ section of the MixConsole. A true workflow enhancement that I never even dreamt of, especially when dealing with different kinds of audio source (line, condenser or dynamic mics…), without having to open the MixConsole for this. Additionaly, we also get a direct access to the Strip section.
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The new behavior of the inspector which more or less follows the suggestions done in an already old discussion (C11 days -2021). I’m glad to see to which point the advices exchanged in it have been taken into account : no more need to use the Ctrl to keep a given section opened and no more endless empty inserts/sends slots display : it’s a true relief. This with new reordering capability.
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And contrarily to what I have read somewhere, we easily can skip some inserts slots to put a given insert in the fourth one, if needed (as shown in my screenshot - drag & drop also works in this case).
Overall, the new channel/track inspector combination is worth the upgrade alone. Congrats to the devs crew for that one. 
Beside these, C13 seems already very stable, here, without additional strain on my system. This, with the workflow enhancements stated above, makes me already wonder if I shouldn’t uninstall the 12.0.70, already. I’m going to wait few weeks, though, as I need to make further tests.
Things I don’t like, though :
- I truly would like to get a solution to the horrible menu bar display I am experiencing, with the full white titles backgrounds :
Happily the Alt key is my friend to toggle its display, but still…
- And yes, the hard white content of almost every now flat buttons in the UI isn’t really a graphical improvement. Just hope that I’ll get used to it, at some point but after several hours of C13 usage, it still isn’t the case…
At the end, a worthwhile upgrade, AFAICS…