I have never wasted my money on toddler formula, however both my girls where good eaters and loved milk.

I did take a couple of months to transition from formula to straight milk though. By 14 months both girls were off ff.

My SIL has feed both hers on toddler milk and I have to say that both kids are terrible eaters and both still rely on expensive toddler milk, one child is 3 and the other 2.