GDC seems to be the only center still using the SB-LM. Their continued use of this very outdated test is controversial. I recall several old threads on this topic but don't have time to track them down. One cited a newspaper article where a family perpetuated a fraud on GDC by having their kid study for the SB-LM. I seem to recall that the article said all of the answers are available on the internet.
That was one of the reasons I didn't test with them. They've been involved in another incident I read abt too, which made me wonder if we would get an artificially high. There is also some concern abt the method they're using in re-norming the WISC. Still, if my hadn't gotten into DYS, we would have used them for educational consulting.