My feedback from testing so far is very positive. I had enormous fun running this spec. More than I anticipated and expectations were high already. Just some possible improvements or items to consider:
1. Missing Bladesong tool tip indication of Agis application with Bladeturn Refrain
2. Clone utility skills should be marked that Clone will be replaced by Blade in skill tooltip. Now it may be confused, that skill is not working. Especially, if all 5 Blades are up.
3. Summoned /stowed Blades are too stiff. Changing targets just rotate all 5 active one at one instance. Could Blade target switch be spread out over the time? i.e random blade is turned towards new target each 0,1s. Just to show those are individually floating "objects" not stiff frame.
4. Idle animations for stowed blades. Those are too static and looks like nice looking, glowing weakaura... Possibly a hand wave or gesture as new blade is stowed in and out of combat?
5. Thousand Cuts is only 1.25x more damage than Rain of swords. Ulti is unbloackable, but can be sidestepped by one dodge roll. Utility is too big to roll out, using single dodge and applies Vulnerability too. Change Thousand Cuts ultimate to channel skill may be. i.e Casting ultyi starts channel for 5 sec. Skill starts with parameters as currently (2860 damage over 5sec) and persists unchanged if channel is broken. So casting and moving have same effect as currently. Maintaining channel, increases remaining ticks by 1,1 for each channeled ticks. High risk high reward.
6. For me it was weary easy to overcap with Blades. Between weapon skills, Psionic skills and Traits I was able to generate them quickly. I frequently had situation where all 4 Bladesongs were on cooldawn and 5 had 5 Blades stowed. Just could not spend them fast enough. This made Blade Renewal blade generation useless i feel. I was not able to use those anyway. Possibly I was inefficient due to lack of practice, but this is my gut feel. Blade renewal would be picked for Distortion effect only, which is not following intended design I think. Possibly Blade Renewal could increase Blade cap from 5 to 6 or 7?
7. Bladesongs lack damage or utility in my opinion. Core Clones at least maintain their utility, even as Shatters are on cooldown or are saved for correct moment to be used. Bladesongs only pull ahead of shatters, if used with 5 blades (as Commander functions as 4'th shattered clone). Bladesongs have no utility as Blades are stowed, meanwhile I can overcap with clones and sill get some utility like damage or simple body blocking. (also Comander dosen't act as additional Blade/Clone in case of Bladesongs). May be add Combo Finisher: Projectile for F1, F2 and F3, while F4 could be Combo Finisher:Blast?
With regards