There are options with more sword skill, there are options with more acc, there are options with haste. Terrible TP piece.
Does not break a skill tier on its own at level 80 with merits + AF body (does with no merits). As I noted on the Symbios Gloves page, not worth combining the two for an additional skill tier either. Debuffs only.
Fortitude Torque/PCC/Tiercel still better for TPing. Sword Skill +4 is 4 attack, and less than 4 Acc. (Around 3.5, rounded down is 3).
The real way this piece shines is being viable for casting, being good for damage and also providing a nice accuracy boost. Like Nexxus said, depending on the new Blue Magic skill tier cap, it may not be useful for some people. This would depend on merits put into magic, as well as amount of Skill+ gear.
This is pretty much garbage for TP (Fortitude Torque is much better).
Possible uses I have for this:
1) MP Drainkiss (and other pure skill based spells)
2) Magic accuracy (the most on a neck piece)
I really wish it was Blue Magic Skill +5 instead of +4 since Lv80 BLU get 301 base skill +16 from merits +15 from AF Body totaling 332 and the next tier is 337. So this still restricts BLU to use Mirage Keffiyeh instead of possibly using this for some spells while allowing another headpiece.
Everyone here jibber-jabbering about how Blue Magic +4 isn't game-breaking, or that Sword Skill +4 isn't all that hot, but you people keep overlooking...