Okay, from day 2 of duels I've updated my thoughts, most are still the same:
1) Nudge animations need to stop doing the weird hit-stop stagger, just remove that one animation, if it looks slightly odd, it'll still look better than randomly staggered and flailing around at close range.
2) Yellow is still insanely OP, holding any sort of ACM against it is near impossible.
3) Purple does not properly half swing, at all.
4) Red is absolutely broken with feints, as you can completely ignore the slow swing windup with feint -> halfswing, making it much stronger than most styles, and forcing a shadow match. Red also instantly takes away any ACM a fast style might have.
5) Do nerf the cooldown on slap to something like 8-10 seconds, slapping is too prevalent in duels imo, and it should have risk/reward to it.
6) Duels are absolutely ridiculously long. I fought with Raptor a few times, and each time it took the entire match length, and we still weren't even close to being low.
7) Make Cyan fun again, and a fencing style. Make it based on parries/footwork/precision, with a good thrust to replace the W swing that can be combo'd. Make it super hard, if you want, but make it fun. Make it Dooku'd. This current version is waaaaay too easy and boring for me.
8) Mblocking on staff is still an issue, either embrace the stagger on mblock to all styles, or remove it from staff as the one unique one. Also, make mblocking on staff require pblocks.
9) Sidewhacking seems to be very prevalent in this mode, might look into that.
10) I'd suggest giving Dual sabers a perk to benefit a defensive approach, and give it a combo limit of some sort. It is too spammy when used right. Make the Kata's interruptable by sabers, but give them a use for Open, like free-deflection during it from a wider angle.