My daughter had the RIAS and then the WISC-IV and the results were comparable, just slightly higher on the RIAS (consistent with what has already been said). She really enjoyed the RIAS.

I think it is fine for most things. It is shorter than the WISC-IV or SB-V, but the scores should be acceptable for most programs (although DYS doesn't accept it). My daughter did very well on the RIAS, so her psychologist recommended the WISC-IV for more information.