You do get typical Nitroplanes service, whatever that means...
It means almost non-existent service. Just try calling the some time. I've bought a few lipos from them and some of their planes actually aren't bad. You sometimes get what you pay for though.
As for the Yak being an exact copy of the QQ 69" Yak, that's really a shame IF
it's true. There are tons of great, reputable companies in China but a few others that are pretty underhanded. I've seen exact copies of Fluke multi-meters, Honda and Briggs & Stratton engines, pallet jacks, clothing, shoes and even a copy of Nissan Frontier truck. These copy-cats don't have any of the development and other costs associated with the product and the similarities are generally only skin deep. Quality between the copy and the genuine article are often not the same although they can be close in some cases. It is a big problem for legitimate developer/manufacturers in the US, Japan, Europe and other places. To profit off another persons hard work is criminal.
It is actually very easy to copy something these days and have that copy come out to be exact. I've seen digital 3D measuring devices that interface directly with drafting software to easily create drawings of an object. You can then play with those digital drawings and cut exact duplicates on a laser table or other type of tool.
Also look at the administrators statement in the thread you linked too. He stated that the evidence showed Nitro Planes (or whoever supplies this plane to them) copied QQ's copyrighted design and manual. He also asked that no other threads be posted regarding this plane due to this.