FYI
I bought a Sigelei 20W with 2 X Sony VTC4 and EHPro KF Lite + clone from a local BM for $80 on July 28, 2014.
Loved it.
Starting about 2 weeks ago the device started "mis-firing" i.e. I would sometimes press the "fire" button and nothing would happen.
On Oct 3, I looked over and noticed it shutting down on it's own. Thought maybe the batt was low. On power up found it still had half a charge.
Oct 4, the next morning, the device shut itself down again and would not come back on.
Put in batt fresh off the charger.
It powered up for about 20 seconds, shut down and would not restart.
Of course there is no (easy) way to open the head to even check what might have gone wrong.
The device was never dropped, in fact given it's size and heft, it was used only in my house and occasionally my car.
I brought it back to the BM. They refunded my $80---they have 90 Day warranty.
Sucks cause I did really like it.
Buying myself a couple of Eleaf ISticks to tide me over until I get a VaporShark rDNA.
Hope your experience is better.