I thought Booty Camp was terrible!! Here is a description of the method.
There are no toys, tv, or outings allowed for the first 3+ days until they use the potty. After first successful use of the potty, they get 1 toy or 15 minutes of outside or TV. If they have an accident, the toy gets taken away.
There is no regular schedule of breakfast, lunch and dinner. If they ask for it, then they can have it, but they have to ask for what they want to eat. Instead, you load them up with chips, pretzels and sugary drinks, but they have to choose their food and drinks including actually opening the fridge to pick their drink, the bag of chips, and putting the straw in the drink if it's a juice box or they have to ask for help to do all these things.
Every few minutes, you hold their hand and have them feel their underpants (no pants or shorts are allowed), and you say "your underpants are dry in the front, no poop in the back. Great job listening to your body and keeping your pants clean and dry" then you give them a treat.
You have to force them in the morning, before nap, and before bedtime to sit on the potty - and they only wear pullups at night and bedtime. And until they pee or poop on the potty for the first time, they get no nap because they will just hold it until you put that pull-up on.
If they have an accident, you tell them that it is not acceptable to have wet or poopy pants and that it is their fault for not listening to their body. Then, they have to clean up the mess even if you have to force them.
Basically, all the emphasis is on the child doing everything for themselves which I think is great, but I feel it should be done in more of a fun way like "let's put your shoes on" (if they don't know how) instead of "you need to put your shoes on" and force them hand over hand to do it.
I also really did not like the "it's your fault" stuff. My son's speech therapist is also a psychologist and she was horrified and my description of the class. The only good thing that came out of this is that the lady recommended that I get my son evaluated by early intervention for possible sensory issues - turns out, he has asperger's syndrome.
Save your money!! Oh, and since your son has sensory issues, he should qualify for free preschool through the school district, and he does not have to be potty trained for that. I understand not wanting 3 in diapers, but I have just resolved that he will be ready when he's ready. Being around other kids is helping. He sits on the potty, but doesn't "go".