I've worked on this etude. Its fairly easy to learn, has some awkward streches in the left hand, but getting it to tempo takes time. As usual, hands separate helps alot.
Another similar piece that I've performed and actually like better is Rach's Etude-Tableux, Op.39, No.5. Of all of Scriabin's etude's I like Op. 42, No. 5 best.