Curvosity like the rest of the sites in the Erotimania network are run by Wolfe and his big gal pal Katt. They are also the two main stars of the site, although there are quite a few other BBWs that make appearances. Most of them don't have video content.
In fact, Katt is really the only one with any videos, although Loralai has one as well. The variety of chicks is nice as they range in size from plump to damn fat. Like I said before, Katt is the star of this site and her big tits and 59 inch ass are seen in over 200 photo shoots, while the other babes combine for a total of 454 galleries.
The pictures are good overall, but the 21 videos are disappointing, in quality not content. They are very amateur movies, which I like, but the quality of these scenes is pretty crappy and does much to detract from their enjoyment. some didn't even have any sound. Not only that, but many of the clips on Curvosity are also pretty short and they are all streamable only.
As for the other nine sites that I saw when I signed in, they are all available to Curvosity members. These sites are all produced by Katt and Wolfe consisting of more amateur fetish and BDSM stuff. Some have videos while others have only pictures.
For about a third less per month than other sites, they do seem to be making an effort to give you a good deal. However for my money, they really need to work on the quality and length of the videos before it's truly worth it.