I've been using this joystick on Flight Simulator X for about five months or so. And for that period of time, I couldn't fault it. The throttle response was very accurate - even to the slightest touch - and the same applied for the rudder and aileron controls. There are plenty of buttons on the base of the controller too, that you can customize using the provided software, which is also very useful.
So having got used to the controller, I decided to let my six year old nephew have a go with it for about an hour. He said that he had no problems with it and he also said that he hadn't broken it. Which made me think that something was wrong with it. So I tried it myself. And sure enough there was. Once I was ready to take off from a runway, I notice that when I pulled the joystick towards me to lift off from the runway, nothing happened. And then a few seconds later, it would mimic my last movements. The problem progressed when I eventually got in the air, and for no apparent reason, the plane I was flying would plummet back down to the ground - me having no say in what it was doing of course. This has gradually got worse to the point where it is pointless trying to use it.
I don't know myself what has caused the problem, but I'm currently looking on the Internet for similar problems and a possible solution. It's a shame really because it was a very good joystick, but perhaps there is an issue over the reliability/quality of the product.