You wanted to know how my reshell compared with the universal TF10: It fits like a glove vs. difficult to fit and painful after time TF10. The bass extends deeper with the reshell, greatly improving the bass to my ears. The reshell mids are more forward and sound, well, nice! But I will be sending the TF10 reshell back because of the treble, which is lacking the sparkle of the universal. This might be in part due to the mids being more forward (and this is with the stock cable). After discussion with Adam, it is more than likely the placement of the filters, which I verified by pushing them back slightly, which increased the treble. I will also be sending the other TF10 back for direct comparison by Adam, so they can get it right. I figure sending mine back along with the universal TF10 will benefit all. Not to mention this week has been a busy one for him as he has a new addition to the family, so it is understandable that things are crazy for him right now. He is a very nice guy and wants to do whatever it takes to get things right which I have confidence he will do.
As is now, the reshelled TF10 is much more enjoyable to me than the universal as the mids are filled in and the bass is deeper, and the treble has a little bit of that sparkle with the filters pushed back a bit. I could keep it as is, but I figure he can tweak it a little more and see what he can do, which will hopefully benefit others with TF10 reshells.
How about that Infinity X3? Should anyone spend the extra on the X2 or X3 vs a reshell? All I can speak for is the X3 with executive option that is roughly $400 more than my reshelled TF10 does sound much better with more refinement, better bass, better clarity, and just sounds like a big step up that it is! The sound signature of the X3 reminds me of the SE530...warm, mid-forward, powerful & deep bass with slightly laid back treble. There is a slight analytical edge to it, but not overly so. With lower end sources such as my laptop, the sound is pretty harsh, and as you move up the source ladder, the sound improves a good deal as well. The best pairing so far is with my HUD-MX1 with the OPA1611 opamps. More to come, but it does compete with my EM3 Pro and Fabs, but is different.