Ordered a pair to replace my iM716s. Those things needed new filters, cable and flanges. Every time I went to try and service them I would add up the costs of all those components and then decide not to bother.
The $99 TF10 in the back of my mind from last year was a huge reason for that reluctance. Why spend $30-$40 on replacement parts when I can get T.F10 Pros for $99.
Finally, my patience has paid off, and 5 bucks cheaper this time.