Depends on your 1) height, and 2) what range of heights you need your saddle at. The taller you are, the more drop you might need. I'm 6'2" and the Joplin doesn't seem to drop low enough for my needs. If I ride with my saddle at the generally accepted, "proper" pedaling height, I can't drop it low enough to get over my rear tire. I often find myself setting the post low at full extension just so I can get it lower at it's lowest. I figure a shorter stem would help, but that changes handling and bike fit.
I would look for the Rase seatpost. It has a 9" drop and doesn't have that accordion-looking wrap like the Gravity Dropper.
I would look for the Rase seatpost. It has a 9" drop and doesn't have that accordion-looking wrap like the Gravity Dropper.