My daughter (adult) uses the shampoo & conditioner supplied by WDW. I need more conditioner in my hair, so I bring my own products. WDW's products are very good, and certainly work for her.
I think that some people (like me) have problem hair & can only use certain products.
As for the soap - we bring our own. WDW's soap is VERY creamy. It is actually annoying at times because I feel like I can never wash it all off. It sticks to you & takes the clean feeling away. Give me my Zest or Irish Spring deodorent soap.