I really like that Black Canary, and I will definitely be preordering her. I'm also curious to see what the other face plates look like. I'm a fan of the costume choice, ultimately as long as she was in fishnets I was going to be happy. I agree that the seam up the back doesn't look great, but once she's on a shelf I doubt anyone will see it (unless they have her posed backward to look at her cake).
As far as longevity, I have an old (and extremely hideous!) Black Canary from the Identity Crisis line, as well as a DCUC Zatanna. Both of them have fishnets just like this, with the ugly seam up the back, and they are both just fine after all of this time. As with most soft goods clothing, go easy on them and they'll last.
Outside of Canary, I think it's just the Superman/Mongul pack (I was really hoping for Exile's Warworld Superman here...) and probably Routh Superman and 89 Joker. I don't know that I've ever been more bored of Multiverse reveals...maybe I've caught "short-timers disease", because I'm honestly just feeling very blah about everything in this line these days.