A long time ago... used it a lot in 80x50 line text mode, lightening fast, good macro and configuration options (ISTR a separate tool to "reconfigure" the main binary). Had many of the same default bindings as the Borland IDEs, handy since the TurboC IDE used to run out of steam around 1000 loc or so, that's when I learned Makefiles.

Never took to TSE, sequence of bad experiences with stability.