I don't have any personal experience with SE therapy, but from what I have read on the forums I've heard it's quite helpful for dealing with CPTSD and devepmental trauma.

I was looking into doing either neurofeedback or SE a few years ago after I had read Bessel van der Kolk's book, 'The Body Keeps the Score' and I had stalled in talk therapy and wasn't getting better. Fortunately I found a great NFB practitioner before I could find a SE T and went that route. Doing the neurofeedback, in conjunction to working with my talk T, was hugely successful for me.