They are hand made (to a degree), so we cannot think of them as factory where no individuality can be found.
I have not found any in ear headphones to match the perfection of these, which led me to take the risk others have taken, considering that German manufacturing's reputation with Beyerdynamic would prevail. I even bought a second pair as my wife loved them. She has mild adult autism and cannot bear anything intrusive in her ears (it took her weeks to adjust from a well known DAC to Mojo, as the sensory overload of more data caused dizziness and headaches; now, she is hooked and wants her own), and has tried so many. Once the fit is made and the seal in place, the soundstage and definition of the Tesla is second to none.
I believe the construction is top quality, yet something went wrong in some manufacturing, and without admitting culpability, they have rectified it as enough of us and enough sellers have said "no issues" or "no returns."
The delay stinks, which only reminds us just how special this sound is. I have come to prefer these above my 2nd generation Beyerdynamic T1s.
This has been, perhaps, my most nervous purchase in life and for me to be given a refund and then to turn around and buy another pair is something I would never have guessed I would do. It is just not my nature.
It has worked out, and this is why I understand Gus' frustration but also his desire to get back the T8's rather than buy something else.
I wonder if a 'hand slip' in sealing the two parts took place to give that mark. Knowing it is under warranty, I don't know if I would have returned them for that reason. Having said that, I wear glasses and am not interested in the look so much, except to love the low profile. I don't like the idea of some blaring red or blue color protruding from my ears, in public.
Obviously it is a personal decision and depending on how much these stretched your budget, the fear is real and it is justified by the experiences of those here. This must be weighed against both the warranty and the sound quality.
As to what else to try...if you loved the sound and don't want to try another pair, I know that I looked into "Angie" and Ultimate Ears Pro as well as 64 audio. I want that "clean" sound.
Egypt, I hope you find a pair you love and can forget about while enjoying your music.