I posted some test results and my impression in the Work In Progress section. I used AEScripts to access the free and paid versions of Corridor Key to use as plugins for After Effects.

I tested using AE only. The left character was keyed using the Corridor Key free version. I paired that with a Hint (track) matte, also created using Corridor Key free.. Second from the left, this character was keyed with Corridor Key Free, but I used the built in effects Primatte 6 and Advanced Spill Suppression to create the Hint matte. Third from the left is a key using Primatte 6 and Advance Spill Suppression only. The one on the right was keyed using the Corridor Key Blace.ai paid plug-in (trial). For me, the middle two look the best. And I believe it is because I used the "shrink matte" setting only found in the Primatte keyer set to 50. And I think they look the best, in terms of edges and detail. I would stress this is only judging keying a green screen animation. I suspect, and maybe someone else can test, that the paid plug-in would work exceptionally well with live action green screen shooting. I think the slight fuzziness of the edges in this example, not good for my animation, would likely bring out detail nicely in hair and clothing in motion. I hope to bring it up in class to get a consensus.

@Michel Diamantis Yes. It does recommend 8gb of gpu. I will say, running an RTX 2070 with 8gb on my desktop, both the free version and the paid version ran smoothly and quickly.