MacRumors published a review on the Beats Flex
A quote from the article:
One of the announcements last week that flew under the radar since it wasn't explicitly mentioned during Apple's event was the introduction of Beats Flex, new wireless earphones that represent an upgraded version of the previous BeatsX. Not only do Beats Flex come with some upgrades, but they also carry a much lower price of just 49.99, representing the most affordable way to get into Apple's wireless earphone ecosystem.Beats Flex Review
The launch of Beats Flex comes at the perfect time, given that Apple has stopped including wired EarPods in the box with new purchases of iPhones, even older models that used to include them. EarPods are still available as a standalone purchase for a lower price of 19, but if you're going to be buying headphones, it's worth looking at wireless options like Beats Flex.