At the start of Feb, using D12, I spent quite a few weeks porting and testing a couple of million LOC.
Opinion, the IDE is a joke, this has to be the worst IDE I have seen, QA needs to be sacked.
These are just some issues I have noticed, note I use it every day.
- the toolbars are wrecked
- the menu system doesn't appear.
- the layout on opening Delphi on my machine opens 1in wide no matter how many times I save a new layout.
- the evaluate dialogs constantly expand and expand upon reopening.
- code insight hangs the system from time to time especially when trying to do a for loop syntax.
The nice things are the compiler is faster at least with my application, I have gone from 6min builds back to under 2mins.
The debugger is working even on a standard compile rather than a build. 10.3.3 would only let us Debug once before the IDE had to be reloaded.
As for the code base so far it's looking very promising. My app is in QA's hands now looking for issues.
But overall it looks a little faster on painting of vcl/forms something has changed I haven't picked what yet.
Given the IDE is not in a great state it is still workable for me at least.
So far I am pleased.