I tried it a few years ago with my daughter when she was in the 6th grade. She said that it helped initially, but she eventually was able to tune the vibrations out. The version we tried was only $100 and it vibrated differently at 5-10 minute intervals. There was no reset tapping either.
If you already have a fitness band or a smartwatch, you may want to let your son wear it for a few days and see if he notices the vibrations when you send a text or a reminder. You could also try contacting Revibe to see about their return policy.