On the ASP and Fly Sky question, yes, you get what you pay for. The ASP engines are a good design (same product as Magnum) so if you get one that's manufactured right you'll have a good engine. The reason they are cheaper is quality control. Duds do come out of the factory that will give you fits. So with ASP you are rolling the dice, whereas with OS or a few others you are getting a good design along with good QC and a motivated service department. Myself, I go for Thunder Tiger. They are a bit cheaper than OS and still have good enough QC to be trustworthy.
On radios, solid state electronics are ridiculously cheap to make, therefore a number of Chinese companies are putting out really inexpensive products. Again, you get no QC and not much service. So if you get a good one, you'll likely be able to trust it for years. But if you get a bad one, it may be a real ordeal to get it fixed. You also will notice a cheaper build quality on the transmitter hardware. You'll get flimsy plastic where other brands use a heavier grade of plastic or even metal, the gimbals won't be as smooth, you don't get the nice grippy material on the sides, etc. I generally recommend buying from one of the quality manufacturers on radios simply because it's an item you are going to put hours and hours of use into. Futaba, Hitec, Airtronics, and Spektrum make proven radios and have good service departments.