Having devised the system, it's of course hard to not be subjective about this, but I dare say that the parry system we implemented has been a great success and truly increased the diversity in the characters you see.
All in all, very are satisfied with how the system works now, but we've noticed that at very high levels and using certain combinations, it's possible to use the system to gain exceptionally high ACs to the point where we feel it's unbalanced. As such, by next update, we've tried with a cap of +5 on the maximum bonus the system gives.
I hope you'll help experiment with this change with an open mind, but please use this topic to share your experiences.