Much better then the Warlock's Boots(+11 MP, +3 Agi, and +10 shield skill) and well worth obtaining for maat fight.
Combine this with the Cobra Unit Gloves and you got yourself a "Moldavite Earring" in terms of Magic Atk. Bonus, with the added effects of hp/mp, conserve mp and magic acc bonus!
Take the time to obtain wings rank in the past and the notes (50k windy, 75 non), you won't be sorry you did.
The argument for these Vs. yigit, well if your a tarutaru with high INT then having 22mp and conserve MP outweights the minimal extra dmg you may get, this can sustain longevity mixed with other conserve mp pieces such as Selenian cap, for soloing on BLM or SCH or for nuking HNM or gods these promote longevity opposed to epeen nukes.
These are arguably the best piece of a rather lackluster set. The only reason to get this piece for a >nuking< set is if you combine it with another piece in the set to get the partial set bonus. Given the quality of the rest of the set we've seen so far, it doesn't seem like a wise choice compared to the other gear that can fill those slots.
Head: AF/+1 or Demon Helm/+1 for INT or Yigit Turban for MAB
Body: Unknown at this time (Morrigan's Robe, Errant/Mahatma Houppelande, Igqira/Genie Weskit, Yigit, Royal Redingote)
Hands: Yigit Gages, Zenith Mitts, Goliard Cuffs, Vicious Mufflers, Morrigan's Cuffs
Legs: Morrigan's Slops, Errant/Mahatma Slops, Jet Seraweels
Feet: Yigit Crackows, Goliard Clogs, Rostrum Pumps, Hume RSE