I use it all the time. In my experience, it produces much more optimized code that the alternatives (which seems to be true for the UNIX vendor's compilers in

I use it all the time. In my experience, it produces much more optimized code that the alternatives (which seems to be true for the UNIX vendor's compilers in general as well)... and as I work on a large-scale system that must perform well, that alone is sufficient reason to use it. It has definitely had its annoying moments from time to time tho.