Well where to begin wont bother with the box etc as lets face it who cares, firstly the stated fps is close but not 100% accurate mine was shooting 280-300fps over 10 shots using ultrair gas ( bought from j.d with the gun) on a warm day after having put about 100 rounds through the gun.
build- as its a clone i was expecting to have a cheaper feeling version of the tm mk23 well i was miles off compared it to my mates tm version and there is very little difference apart from the mould lines on the abs ( ever so slightly raised more than the tm) you really would be hard pressed to tell them apart from an exterior view.
action- has a nice dual stage trigger (first click locks the hammer back, second fires the weapon) saftey is easy to reach and operate and for a non blowback gun it does have a tiny bit of recoil as it fires ( nothing to scream about but still nice)
silencer/barrel extension - does nothing for the range accuracy as a barrel extension so i popped it open and removed the barrel extension then popped it on as a hollow tube tested with and with out it on from in front of the gun and there's a noticeable drop in sound again nothing drastic but over a longer distance it would work quite well to mask the shot.
mag - now could be just mine but when i first filled it there was a slight leak ( probably when assembled) took all of 5 seconds to fix ( tightened the valve) easy if you know what your doing but for sumone who has never used or tinkered with a gas gun wouldn't be great, once sorted i got about 2 and a bit full mags out of each fill.
so to sum up
high bb/gas output
leaky mag straight out of the box
oh and non blowback (but we knew that allready lol)