I think the daggers that float around you seem a bit clunky when switching directional movement, I guess I wish the animation when the daggers change direction was smoother. Also the Infinite Forge grandmaster trait always stocks the blades asymmetrically (1 on the one side and 2 on the other), I think this should be switched to 1-1-1 distribution around the Virtuoso. Also agree with other commenters that not giving Mesmer dagger off-hand seems like a missed opportunity and that the F1-F2-F3 skills are pretty unimaginative as they don't feel much different from normal shatters, I interpret the Virtuoso as being basically a mesmer that forgoes it's clones in order to focus on shattering, in that I case I expect the shatters to feel a bit more distinct in their effects as well. F4 is a great example of what I would expect!