Six months. I have not listened to a lot of headphone amps, yes.
Inadmisible background noise
Sound quality not to go
I do not do the selection.
Say it is convenient to emphasize its quality and it will if you need multiple headphone outputs.
By it against background noise too loud which makes it useless to try to listen to anything with headphones; the sound quality is not there either.
on the other hand to spend on headphones mixer or recording several items at once this can happen.