Ok so I just had some more time to directly compare my H9i to my H9. For me the H9i wins it. H9 felt a bit clumpsy on my head now that I had the H9i on for the whole day, but the main point: the H9i handles the bass way better. The muddiness of the H9 becomes quite clear in a direct comparison. I don't dislike the depth of the H9 and with some tonetouch adjustment it is fine, but it feels a bit out of control most of the time, and listening to various songs on the H9 and H9i, my conclusion is that you simply get a more realistic experience with the H9i. I used the H9i's ANC for the first time in a real world situation when I walked back home today after work, and it's an enormous improvement compared to the H9. It was how I hoped the H9's ANC would have been in the first place: real silence (apart from sudden noises like bike bells ringing etc, which I don't mind not having filtered out completely when outside). Very pleasant. However it doesn't handle the wind much better than the H9 does, no noticeable improvement there. The proximity sensor works when at the office - sitting down, but when walking outside it is just too sensitive I guess, and I get the same issues that others had (sudden and irregular pauses/plays). You can turn the sensor off by pressing the button up for 2 seconds, and then when the light gets blue you double tap, and you get a red light. Then it's off. If you do the same again, after the double tap the light turns green and it's on again. So at least you can choose to only use it when at the office or sitting in a plane for example.