Unnecessary Necessity

Inspired by another post, even though it is baby related I'm putting it here. What is the baby item everyone said would be a waste of money and turned thier nose up at that you could NOT live without. And how much did it set you back? 
Our Baby Breeza all in one sterilizer and dryer is THE BEST unnecessary necessity that we bought. Wash it and walk away come back to sanitized and dry bottles. We used gift cards but I think we spent 89. If it died tomorrow I would buy another in a heartbeat.