- How long have you use it?
3 months.

- What is so special that you like most and least?

Most?
* The price! A headphone amplifier 2 channel, 8 headphone jacks for less than € 50 ... unbeatable
* Practice: button more than sufficient, Pan, Volume per channel, LED level ... have everything you need for a headphone amp for recording session of a small HS modest.

The least?
* Cheap plastic construction => not heavy enough => it is moved easily by turning the knobs
* The sound quality, correct but flat. As said another opinion: it is more than enough to save but it is better mix fine without him.

- Have you tried many other models before buying it?
None.

- How would you rate the quality / price?
Honestly? Just fine.

- With experience, you do again this choice? ...
For the price, yes.