The roads in my area are horrible so I decided to give one of those inexpensive pogostick seat posts a try on my trekking bike. It definitely made the ride significantly more comfortable, but was functionally less than ideal, and didn't last very long.
I am awaiting delivery of a Thudbuster LT for my cargo bike because although my initial experience with a suspension seat post was a failure, it did prove to me the merits of having one.