I've been looking for a cheap none shit 27.2 dropper for a while, can you give a brief review of build quality/function i.e. How it operates and if there is rattle/play etc
It's a KS post. It will be nice whilst it works. When it doesn't work, it won't work.
As with most MTB bits that have pressurised gas and / or oil in them, it's worth considering the chances of a warranty repair / replacement and shop support should they go wrong.
If you don't need a remote or >100mm drop, I just got one of these for my Explosif and it's an absolute steal
http://m.ebay.co.uk/itm/Height-adjustable-Bike-Vario-Seat-post-Kind-Shock-ETEN-27-2mm-400mm-long-/201865036182