The AMP telescoping seatpost was given to me as a birthday gift by SJ based on recommendations given to her by our friend Ryan K.  It weighs about 470 grams including remote and cable so it weighs about 200 grams more than the 27.2/410mm Thomson Elite seatpost that it replaced. The version I got was a 1" and 3" drop.  Actuating the remote unit was as simple as pushing the remote lever forward and putting weight on the saddle to lower it and then releasing the remote lever (the seatpost will remain lowered).  Raising the seatpost involves pushing the remote lever and getting up off the saddle at which point the saddle will go to the preset normal riding height at which point you release the lever.  The AMP also comes with a neoprene boot that covers the spring and detent mechanism.  This product gets a two thumbs up from the SWIMBA Wrenching Crew.

For more details, visit: http://www.precisioncyclingcomponents.com/amp.aspx

Pros:

• Simple design
• Cable exiting the seatpost is not obtrusive and is easy to route to the handlebar
• Relatively lightweight
• Solid seat clamp head design
• Mechanical (no air, no oil to leak) reliability
• Available with shims to fit 30.0, 30.9 or 31.6 sizes.
• Other than a few drops of oil every few months, this product requires zero maintenance.
• Excellent Customer Service

Cons:

• Heavier than a regular seatpost
• Extra clutter on the handlebar
• Some rotation play on the upper shaft that can't be felt while riding

I've been thrashing the AMP for the past 8 months through winter mud, summer heat, water crossings, etc...  It has been used and abused in Moab, Gooseberry, Fruita, SoCal, NorCal, Sun Valley, Stanley, and our local Boise trails.  It has survived and functioned perfectly even after numerous crashes.  It works so well that I actually use it more than my front shifter on most rides.  Although it has the 1" drop, I almost never use the 1" drop setting.

The only recommendations I would make to the product would be the addition of blue loctite on the center bolt (that goes through the remote bushing) to keep it from loosening up.  When this bolt back out, it causes enough slack in the lever mechanism for the ball bearing in the detent to fall out of place.  Also, in addition to making a multi position 1" and 3" drop, I would like a multi position 3" and 4" drop version.

To route the remote cable to the shifter, I simply attached it to my rear hydraulic line using small zip ties and section of irrigation tubing.