You don't hear alot about them because they are considered by most to be good preamps, but not great preamps. They dont really give you the mojo that many of the other pres you see discussed here impart...
I've used the ones in the 9000J and while they aren't bad, they generally dont get used for the stuff thats considered really important.
The eq, dynamics, automation, routing, number of channels and sound of the board is what SSLs are really all about.
"I know that most men, including those at ease with problems of the greatest complexity, can seldom accept even the simplest and most obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have delighted in explaining to colleagues, which they have proudly taught to others, and which they have woven, thread by thread, into the fabric of their lives." Tolstoy