I recently upgraded my 9500i to an ix and got a beta install of the soon to be available firmware update for the 9500 family. It features TSR as a band option. You can read about it on Escort's forums.
I had my 9500i for over two years before i upgraded it, so i had become very familiar with its strengths and weaknesses.
But the 9500ix is another detector altogether. Love the autolearn feature and usually keep the sensitivity in Auto NoX. It's quiet, and from that background of silence, real threats stick out.
Usually, I can now tell when traffic radar is behind me or in front of me--the filtering algorithms seem to be faster. Its response to real threats reminds me of older detectors I've had which filtered very little and annoyed greatly with lots of falses. In contrast, the 9500i's ramping on a signal was audibly and visually vague to me.
In short, it's the detector i hoped for when i bought the 9500i two years ago. Kudos to Belscort, I am very happy.