Let me expand my likes of this site for you.
First, to get the best use of the site you need imagination and variety because the site has many areas in which to aim your blogs.
Unlike most of the other blogs I have encountered SU is way ahead of the market in one HUGE way, rather than playing hit or miss by sending a blog to one site, SU is segmented which allows you to aim your blogs at certain areas and not get involved in areas in which you have no interest-sound good-believe me, my reads are in excess of 300 per day, compared to a max of 200 on G+.
By doing this SU gets you to think of new areas to expand into and as writers we need to keep exploring-or are you happy in your comfort zone?
If you wish to write erotic love stories, you can select the menu for that section which means the story has little chance of being read by those not able to understand sexual behaviour.
The only down side for the site, you never know where you get read, but judging form my readers on G+; it's a safe bet to say at least 70% of the readers are in the USA.