What are you considering TLP to help remediate?
We did the full Tomatis program and then followed with TLP. My dd had expressive language issues, auditory discrimination, auditory memory and overall auditory processing deficits.
We saw very good results(improved her auditory discrimination significantly, made auditory memory cognitive therapy easier, attention and learning overall became much easier for her).
There was some aspect of Tomatis that was not 'sticking' though and we would have to go back and do boosters every couple of years. I saw much more noticable results from Tomatis (as it's customized and goes deeper) than TLP.
We've continued doing sound therapy for 8 years now. Everytime we go, she improves in some other area (ex. her ability to auditorily visualize or image happened after the 3rd round).
You need to go in with the right expectations. Example, it's not a reading program, you still have to teach them to read and if your child has visual deficits vs. auditory, this progam may not be the right choice.