Is it an agency? Or is it a publisher? Or is it an author services company?
Damned if I can tell from the website. I picked several of their authors at random and all their books on Amazon are listed as published by "Amazon Digital Services" - in other words, self-published. So I'm not seeing how SBR functioned as an agency for them. (The vast majority of the books I looked at were digital only, and most were being offered free of charge.)
If you click on "About SBR Media," you get a bio about owner Stephanie Phillips, written in third person with the occasional odd lapse into first person. The bio claims SBR is a literary agency, but I get the impression Phillips is the sole agent, has no prior experience as an agent, and her only publishing experience was nine months with
Booktrope.
More weirdness: SBR announced the April 2017 publication of an anthology featuring works by their authors, but the buy links for the anthology (for Amazon, B&N, iBooks and Kobo) all result in "page no longer exists" messages. And then there's the big "Author Services" tab at the top of the main page, which has absolutely no place in a real agent's website.
I dunno, josephperin - there are red flags all over the place with this outfit. I'd think twice before submitting.