We're using Live++ at Mojang. For very large complicated software, we never had any success with VS Hot Reload. Live++ works like a dream and has had noticeable productivity improvements for the devs that've tried it.
There is a comparison between Live++ and Visual Studio's Edit-and-Continue here:
https://liveplusplus.tech/faq.html
In our (and many of our customers') experience, E&C doesn't work for anything larger than simple toy projects. It just isn't reliably.
On top of that, I think its biggest shortcoming is that E&C doesn't work with optimizations at all (this is documented), and is tied to the Visual Studio IDE, which not everybody uses.
But I would have liked to see a comparison of this solution to others on the market, like the readily-available "Hot Reload" in Microsoft Visual Studio.
For a multi-MLOC codebase, VS "Hot Reload" required some patience, and it mostly worked only for simple cases like changing "if" statements or constants. But that's actually all I needed at that time, and considering that I was using VS anyway, I was happy with not having to pay extra.
So, did somebody try out the Live++ hot-reloading technology and could share their experiences?