hi,
i am new to this,
i have a question that
apm 2.6 clone is worth to buy 
is it reliable ?
thanks 

yes, Apm is open source.. so anyone can produce it.. so you cant technically call it a clone. i have used the one from rctimer for a long time on both planes and quads.. it works great for both. Quad requires a little more effort of tuning it though.For planes its a bargain for price for features it offers.

i am looking to buy from ebay
http://www.ebay.com/itm/APM-2-6-Flight-Controller-w-6M-GPS-3DR-433Mhz-Telemetry-OSD-Power-Module-/390941907362?pt=Radio_Control_Parts_Accessories&hash=item5b05f419a2

I am selling complete apm kit 2.6
http://www.rcindia.org/index.php?topic=19530
If booked tomorrow ie money transfer then free shipping