Nice controller with interesting features.

It's an entry-level controller, no doubt about it. Native Instruments doesn't try to hide it and I knew what I was getting when I bought it.

You get some Native Instruments interesting features embedded in it (the preset configurable effects) but nothing too fancy. The price you pay is fair.

The sound quality is average and the output is about 90dB... (my S4 MK2 is considerably better AND louder)

It has only one RCA unbalanced output and an AUX (audio coming from this output is considerably lower) and that's enough for gigs where you have to carry a lot of gear and can't take a huge controller with you.

For me, it's an inexpensive and very portable way to move around from club to club without too much hassle. I get the S4 basics (effects, sized loops, flux, etc) without the extra weight.

If you're looking for something that does the job for a really low price, this is the way to go.