I've been using this headphone amp for about one year now. It's a single rack mounted unit, so it's convenient to set up at the studio and keep it there, or to put it in a mobile rack if you do on-location recording. You can use up to 8 sets of headphones on this unit, which is more than most would need. Each channel has its own volume control, plus a master volume control for the 2 mixes it can use. They can get very loud! Be careful when setting your levels - you could blow out your headphones and ear drums. Each channel also has a mono switch, and a toggle switch to use either mix 1 or mix 2 coming into the amp. Another convenience is that you can insert your headphones into the front or rear of the amp, which cuts down a bit on cable tangling. I will say however that this headphone amp is quite noisy as you crank it up. You start to hear a lot of crackle and hum at high volumes, and it seems to increase as the channel numbers increase. So the first headphone insert is fairly quiet, but the 8th one is a lot noisier. However, as most will usually only be using the first maybe four or 5 at a time, it's not as important. And truthfully, even when it's noisy you can still hear the program material pretty well, so all but the fussiest of musicians will probably be fine with the way their headphones sound. This unit is quite cheap, as with most Behringer products. While the noise is a little disconcerting, it's still a great value, and unless you're super picky about noise when you're monitoring, you should find it a great value as well. I'd buy it again.