Have you used a "remote adjustable" seatpost? (Crank Bros Joplin / Gravity Dropper etc)

Has anyone used a Crank Bros Joplin Adjustable Seatpost - can you share your experience?

http://www.crankbrothers.com/seatposts.php

I'm thinking of getting one of these for my Spesh Enduro Pro. I like the idea of a remote adjustable seatpost ...as it's a bit of a pain to stop and adjust my extended seatpost every time for a descent.

I've read the Joplin reviews on the web but wanted to see one in real life (RL) before I fork out the moolah. Any sightings in LBS's in Sydney, so I can compare the Joplin's setback to my current stock Thomson Elite (20 mm setback)? I've also emailed T7 with this query but no answer yet.

Thank you in advance.

Rgds Hans