I have very mixed feelings about SBV.
A little bit of background. Despite knowing better we had DS5 take WPPSI in summer. Both his PIQ and FSIQ were in the 99.9% but lower than the DYS cut off (150 for WPPSI). His VIQ wasn't too far behind.
DS5 took SBV a few months ago. On one hand he got qualifying DYS score in the nonverbal section. He also scored more 19s on SBV than on WPPSI. On the other hand he had low scores on three consecutive subtests. He ended up with VIQ significantly lower than his WPPSI VIQ which brought down his FSIQ.
I don't think those 3 subtests clearly represent his abilities as they differ greatly from his WPPSI results and his other two SBV verbal subtests, which were both 19. Was it the test? The tester? DS5? The age? Most likely the latter two. My guess is that he had had enough by then since all the subtests were towards the end (#7-9 out of 10).
If you are looking for DYS scores I think WISC is a better bet with the extended scoring as well as the GIA option available.
