The problem with buying cut-rate cheapest-offer from China is that you often don't have a vendor there to support you.
There's a reason companies like SparkFun, Pololu, Adafruit, and the like charge more than the cheap Chinese eBay sellers. It costs money to run web sites, answer customer questions, and the like.
I recommend a Maestro servo controller from Pololu. It works well, and it has good support and instructions from Pololu. Their employees also answer questions in their forums.
I also think there's a version of the Axon that does servos, and is supported on this very site. As a bonus, buying that version will support this web site.