Hey everyone, I just wanted to share some first impressions of the Fiil T1 Pro I got today. Note these are my first TWS and I was used to the VSonic GR07 Classic for use "on the road" and Audio Technicas ATH-M50x for use at home. As those are my daily drivers, these were what I compared the T1 Pros to. I also want to emphasise that the T1 Pros are my first pair of TWS, so I wanted to offer a point of view of someone coming from regular headphones/IEMs, mainly wrt sound quality.
Honestly, when I ordered these on 11/11 for $58 with all the coupons and sales, I didn't know what to expect, and although my expectations were kind of hyped from Scarbir's review, I didn't expect these to match my VSonics SQ-wise. Well, turned out I was right

Having said that, though, I also have to say that I'm writing this text with the T1 Pros in my ears for over 2 hours straight with a smile on my face, so let me elaborate on that a bit.
*First impressions*
When I first turned these on and played the first track that just happened to be currently on my Spotify playlist, I was unimpressed. There was too much bass for my taste, the mids were way too forward causing that unpleasant "blanket" effect. Admittedly, "Behold The Crown by After The Burial" didn't really shine on these.
*Testing and tuning*
I decided to move genre-wise to a couple of pop-rock(ish) tracks, which improved things a bit, but still didn't reach the expected SQ level, so I started EQ-ing. Decreasing the low frequency spectrum just a little bit and then the mids by a bit more got me to a level where these started to sound pleasant to me. Now that I'm writing this it leads me to think whether I "tuned" them to a V-shaped sound or just corrected overemphasized mids, but I'll note that I used a completely flat equalizer (sometimes increasing the low frequencies by a very little bit) on the very neutral VSonics.
Anyway, even after doing this they still do sound very different, but after a few A/B/C comparisons between the Fiils, Vsonics and ATHs, I started to realise I'm actually getting to like the sound signature and found myself enjoying the music. Yes, on certain tracks the bass is still over-emphasized, but the mids problem could be pretty well eliminated by EQing, and I found the highs pretty good as-is. In terms of soundstage (and I gotta admit I am no expert on assessing this), I find the soundstage pretty mediocre compared to both the VSonics or Audio Technicas, but not to the point that it would annoy me. Unless I'm doing a direct A/B comparison with something clearly better, I don't really notice any shortcomings in this area, mainly after getting accustomed to the sound.
*Summary*
I have to say, that for less than $60, I'm impressed. I can totally see these being my daily driver for situations where I'd normally use IEMs, i.e. work commute on foot, getting somewhere by public transport, or just moving around the house while cleaning the apartment. These won't replace my full sized headphones for sure, but for the aforementioned use cases, or just some casual listening in general, these definitely won't end up forgotten in the bottom drawer.