Is shampoo and conditoner something you should invest in?
Is it worth paying a little more for? Does what you get really make a difference?
Definitely. Your shampoo and conditioner can make all the difference. Depending on your hair type, you should get a gentle shampoo low in sulfates (or no sulfates). If you spend a lot of money on them, make them last by stretching your wash days to 2/week. Or use them once a week and use an inexpensive co-wash the other days.