Quote - That's not true gamma correction.

Oh.

Quote - Postwork GC has several common failings.

I was unaware of that.  Thank you for clarifying.

Quote - Of course, if you're not interested in that last 5% of quality, none of this matters so you don't need the "Pro" version.

I think it's really a question of how high-quality one wants their renders to appear.  I'm just a hobbyist, and wouldn't be able to tell one way or the other whether a render had GC - postwork or otherwise - without knowing what to look for.  I learned how to create dynamic cloth the other day, and ran a few cloth tests using GC on Andy.  They looked pretty good to me.