Unfortunately, they didn't turn out to be as expected. As an opponent I immediately noticed that the Black Knight was extremely easy to core. It didn't make much sense to me as this 'Mech had everything going on for it to be the tankiest IS heavy in this game, bar none. At first I thought perhaps people just didn't torso twist well with them. Then, I found this hitbox image floating around in the forums:
|NO GOD, NO PLEASE NO!|
Looks like PGI somehow noticed the negative feedback and our favorite developer Alexander Garten announced that the BK hitboxes are being looked at. Looks like they want to reduce the visibility of the CT hitboxes from the sides, which should increase its responsiveness to torso twisting immensely. It also means the CT hitbox is getting a reduction.
So I'm happy that PGI is at least working on making the Black Knight a bit more attractive rather than simply moving on. I also hope that they keep the role and limitation of the 'Mech in mind and do the hitboxes accordingly before their release.