Got one like this, http://www.ebay.co.uk/itm/FORCA-SPS...K_SportGoods_CyclAcces_RL&hash=item19d4d48e4f
except that it's just the straight 100mm dropper - not the variable position.
I bought it for my wife's yeti and she used it a few times but complained that the colours clashed with her blue/gold scheme - so she now has a plain black gravity dropper.
I've been using one for a couple of years now on another bike. They are pretty much gravity dropper clones and are robust and easy to service (not that they need it very often). It has the extra rubber boot to keep the grot out.
Can do pictures later.
Anyway £45 posted in the UK if it's any good for you.
Rich
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Here we go.
The post is 400mm long and has 220mm of proper post below the droppy gubbins if you see what I mean.
I'd have to take the post to pieces to take the boot off, so there's a couple of shots with the boot raised and lowered. There's a small bit of wear on the anodising on the top part of the post but it's slight and there is no noticeable play in the post when in use.