i have ALL the drippers from FT and most of them are very nice the y1k and nimbus are well made and with a little opening of the airhole produce mondo vapor. the y1k (cyclone) is pretty much my fave right now
the m4 is a phoenix clone and is very sturdy for the price, the
threads are super smooth and works great. its always in my bag as a back up
the M5 is sort of an A7 type clone. pretty heavy and fits an ego perfect. even comes with a thread cover.
waiting on a nimbus2 now.
the real cobra is titanium and costs $150 my fav geni. so it is def a clone, a few peeps seem to think for the price its ok.
for the prices you cannot go wrong, and most of them will actually surprise you.