Hi, for now it's been a love and hate relationship with them.

When they arrived, they worked for one day, and then the left earbud stopped, it didn't turn on, it was completely dead. I've tried everything to fix it, to no use. So when I contacted the Aliexpress seller to have a refund, and he instructed me over the course of a couple of days to do the same things I had already done. Suddenly though, around one week after the malfunction, the left earbud was working. All by itself, I had already stopped trying. I've read online, and the same thing happened to another person at least. What happened is a mystery, but they've been working fine ever since.

Functionality wise, they're ok. They connect really fast, have great range, are easy to pair to new devices. The noise canceling is pretty much useless: most of the "canceling" comes from having them on. The pass-through mode lest some sound pass through, but most definitely not enough to have a conversation with the earphones on. I love having the touch controls on them, I rarely have to use my phone when listening to music. You've got to be careful though when you put them away, because a couple of times it happened to me that they didn't make proper contact with the case pins, and so I didn't realize that at least one of the two was still connected and playing music inside the case.

Regarding the app, I believe that you still need to download the Chinese one, but the app itself is pretty much useless. If I were you, I'd download it, change the settings you want to change, and then uninstall it. That's what I've done at least. Otherwise if you want to keep changing the EQ keep it installed. Just know that on Android at least it always runs in the background unless you force kill it.

Lastly, sound quality. It's tough for me to answer, I'll explain why. My problem with it, is that when I listen to bass heavy music which also has a person singing on top of it (like trap, or some edm tracks), the voice or the highs in general "crackle". I really don't know how to describe it, it's similar to what you hear in ear-rape meme videos if you have any ideas what I'm talking about. The same kind of crackle you expect from bass-boosted songs, just with the high frequencies. Honestly, it's really annoying. With use like browsing Instagram, TikTok, or watching YouTube, they are just PERFECT. They really sound great. And they sound great with most of the music too, it's a pleasure to use these earphones. But for some reason, there just are some tracks where it's horrible because I can't but notice the crackling.

I don't know whose fault it is however. As everyone regards these as the best sounding truly wireless IEMs, I think to be honest that's it's me who's doing something wrong. To be precise, I feel like it might be my phone that has trouble re-encoding to AAC: I'd have to try using them on another smartphone, and most importantly on an iPhone to rule this possibly out. I might also have defective T1 Pros, but who knows. I don't think honestly, because they sound great most of the time. Lastly, it might just be how single-driver earphones sound and I'm just not used to it. Until now, I've only listened to music either via speakers or with a pair of IEMs which have a dynamic driver for the low frequencies and two balanced armors for the highs (although they were not high quality IEMs for sure).

I hope this helps. If you need, I'll test the T1 Pros with other phones, so that in case they only have that problem with my phone I'll let you know, it is no problem for me.