Three separate times the Track clip Pro portion of my TIR broke on me. The problem is the swivel part, that holds the two IR prongs to the headset clip, only consists of two fragile little plastic clips that hold the IR reciever prongs in place and allows you to rotate them. And you only have to break one of these two clips to ruin the unit.
So I wrote to natural point, again, and told them the unit they fixed two times broke again. They replied that they redesigned the track clip pro cause they had so many problems with the old design, "same thing happened to a lot of customers", and they will send me a new one for free.
I just wanted to put this out there if anyone else had this problem. I dont use TrackIR for AH but do for other games.