I just started using it this week and they worked on the first try. Which is surprising because usually with any kind of speech technique, they typically don't work right off the bat in spontaneous speaking situations outside a controlled setting. It typically take consistent practice in a controlled setting before you've built up enough the muscle memory to execute them in everyday speaking situations. So just thought I'd share it since it's been effective on so little practice. Imagine if you put more effort and practice over a long enough time and build that muscle memory.. One thing I'll say about what you said above is that block modification techniques also helps people become less afraid of blocking. Which is the core fear for pws. It can decrease anxiety around speaking which leads to less blocking overall because ur less anxious . It's not just about the short-term fix of addressing blocks in the moment. It's about changing one's perspective around speaking situations and increasing one's feeling of agency, that they can do something about their blocks.