Grailed is strictly for menswear. What I like about it from a seller's point is that it has three levels to list your items: Grailed (the highest) to Core (the lowest). Core is for Ralph Lauren, Levis, those kinds of brands. Grailed is for the $300 t-shirts! And $1000 Athletic shoes; Jeezys.
The Good:
From a seller's point, I like the ease of listing items. I like the way my items look in photos. I like that they have a low % fee.
The Not so good:
But on the opposite side it seems lately the site has really been MIA. No traffic. I sold a couple of items within a month, and since then nothing is looked at or sold, so I think the owners and staff have taken a vacation and may not be working the site. They could also take a hint from Ebay and send out tips & announcements, letting the sellers know if their listing needs improvements.
It also seems to want to be an international site, doing a lot of business overseas, esp. In Asia. I'm not sure if they filter the sellers and care if they are selling knockoffs and pirated goods.