This was the first IEM which I have purchased.
Pro
The neutral sound signature sounded very good for my preference. It worked flawlessly when I used it with apple music on an iPhone. I used both a dongle DAC and the Apple 3.5mm to lightning connector. Honestly couldn't tell the difference between the two.
Cons
The fit of the ear-piece is troublesome. This was a common problem highlighted in many reviews which I had gone through before making the purchase. I have medium sized ears. I replaced the stock ear tips with the extra tips which came with my sony earphones, the budget ones, and it fit really well after that. I've used it for extended periods of time without any pain.
I burned in the earphones overnight purely because it was recommended in the online reviews.