I use Har Bal.
older version.
works great.
i mostly use it to check my stereo premastered mixes..... the longer i've used it, the less i've needed it.
in other words, a great mixing tool..
i use it ONLY for subtle EQ changes.....
things that i can't dial in with my room and monitors...
i use WAVELAB to actually master,
and WAVES plugins, Linear phase EQ, linear Phase multiband, and L2 limiter comprises my entire chain.
i use PAZ analyzer across my master buss as i mix,
if i find any PHASE issues, i fix it in the mix,
and rarely have any,
and i also use DC cut as part of my tracking,
typically my stereo files have almost no DC showing up on the analysis.
to my ears, it sounds completely transparent.
i've never picked up on an anomalies, artifacts, nothing.