My experiance has been very good. If you look at my account I have over ( 1900 likes) to prove Ive been one of their long time customers.
Ive had one frustrating experiance where a $25 charger was lost in transit.
Other than that all the cables , wires (we simply get "ripped off" on cables and wire at the LHS) and switches, servos , batteries have been great. ( Ive bought Thunder Power and had problems with them also )
I love the electric motors (have over 25) and use them in almost all of my planes. They have been excellent at 1/3 the price of eflite and others.
My 50cc Yak is pulling 4000+ watts out of a $65 motor and runs great. I blew up one of their HV ESC's but then again look at how many Castles were catching on fire.
My 2M pattern aircraft uses their 5000mah 5s batteries (this is the only plane I dont have a hobby king motor in)
No electronic component will survive stupidity or neglect.............and there seems to be allot of that in this hobby.
I support HK 100%