Logitech Wingman Xtreme digital 3D user here.  Have used them for about 3 years.  Good sticks, comfortable, buttons well placed, inexpensive (usually $40 US, on sale for $30).  
My beef with them is that the rudder twisty axis goes spiky after about 9 months.  Each time, I've called Logitech, and they've sent me a new stick with few questions asked.  I think they know it's a design fault, and for some reason would rather just replace it rather than redesign the stick.  So I have 3, all with bad twisty axis.  Bought CH rudder pedals so I don't have to deal with it, but I still use the stick.  Still like them too.  Just not the rudder.