They have an amateurish website and have seemingly never published a book.
They have
two YA books released, by Lauren Hammond; the books are available in print via the website and in ebook via Amazon, Smashwords, and B&N. I don't know if Ms Hammond is connected with the staff in any way, as there is no info about the press's owner or staff, but Ms Hammond has (according to
her blog) published a
number of books, and also works as a
literary agent.
Prior to this I'd never heard of Hammond or SB Addison, but the descriptions of the two books did catch my eye, and with the ebooks priced at $US1.50 they looked like they might be worth trying. However the
reviews of the SF novel suggest that the book is poorly edited with a lot of incorrect punctuation, which would drive me mad, so I reckon I'll skip it after all.
At any rate, the SB Addison site doesn't look like it's being kept up to date, and with the dearth of info available (and the outdated "closed to submissions" notice) I agree that there's probably little point in putting this press on one's to-submit-to list.