I've been using it with C++Builder for some time and love it.
I'm on the max £150 plan and only use the Opus model.
I haven't got around to setting up automatic compilation, but it's no big deal, I have CC running on WSL1/Debian so it's simple enough to just paste in any compilation errors, let CC fix them and just click to compile again.
(actually my biggest bugbear is probably the cutting and pasting in the terminal, despite what it says, it won't use cntrl-c/v and I have to paste via the menu, I probably need to use a different terminal).
Overall, I'm astonished at how well it understands my requests and is able to give me what I need. The results are rarely perfect, but I'm fine with that, the fact that it can get something to 80% complete by itself is good enough for me.
I think the main trick to using it is to work out when it's probably reached its limits on a particular task, and rather than just keep asking it to fix things, realise it's time to jump in and do the rest yourself.
Des