Before the Lev or the Reverb, there was the Gravity Dropper.
You ever wonder why you don't see DH racers with their seatpost extended XC style with 8 or 9 inches above the clamp? You get tons of power when you have optimal extension in the seated position. Why doesn't the DH crowd take full advantage of that with a high post? It's because one of the first things you learn riding DH is that lowering your center of gravity drastically improves handling. It also lowers your chance of launching OTB. Being way ahead of the curve (a curve taken at full speed due to their low center of gravity) Gravity Dropper was one of the first companies to manufacture and market an adjustable post. The Turbo LP is their latest offering.
Got a quick release seatpost clamp on your bike? Replace it with a clamp that works better for a dropper post here. Seatpost Clamps.
Awesome. Install was simple. I don't know why you would ride without one. FYI, make sure a 400mm post will fit you and your bike. Its pretty long. Also, this comes with a left hand remote only. This means it will be on top of the bars on the left or under the bars if you mount it on the right side. Highly recommended.