Here is a good interview with Taira Masaji shinshi:
I highly recommend Paul Enfield shinshi's YouTube channel which has many excellent videos including (but definitely not limited to) many starring Taira shinshi.
I am certain many people (at least the old fogies like myself) will remember Enfield shinshi as the rather athletically built uke/assistant in Higaonna Morio shinshi's Panther Video library.
I also highly recommend the videos of Taira shinshi available from Enfield shinshi's website:
Goju Karate Center Carlsbad
I've purchased videos from 2010, 2011, and 2012 and have been deeply satisfied with all of them.
If you want to improve your karate (and this includes people who study arts other than Goju ryu) I strongly suggest checking out Taira shinshi and his students.