I've had it for 3 days now and I'm really impressed, especially for the price. I did quite a bit of research before buying this amp as I needed something that checked quite a few boxes without much compromise. Those features being: 1) real pre-amp functionality, not a pass-through, 2) low enough gain and noise floor for sensitive IEMs, 3) enough power to drive my HE6se v2, and finally 4) good value for money. In the short time I've been listening and playing around with it it 100% checks all those boxes.
Also, the relay muting on power up and when switching I/O is a really nice feature that I have only experienced with my now second newest amp, Emotiva BasX A2m. Having no pops or clicks coming through the headphones or speakers (when using the pre-amp) is always reassuring.
If I were to nitpick, I'd say the volume knob feels a bit cheap and plasticky, as well as the actual movement of the pot feels a little too loose. I'm used to higher quality ALPS pots having a bit more resistance to turning than this one offers.
Overall, I'd say this is by far the most versatile amp I've owned and has about as good of a build quality as one could expect for the price. This will definitely be a keeper!