In case your facial muscles are tight,
Muscle massage could be a bit uncomfortable (just like body massage - if muscles are tight, treatment is painful).
However, it could all be easily adjusted, so there wont be any pain if you request.
Intraoral massage is a bit unpleasant, but as clients say "in a good way", as you feel how your muscles release during the treatment.
At the beginning
Bone massage feels more "strange" than painful :) after that is is quite pleasant, as you feel how tension releases.