It's interesting to say the least. It gives me troubles for most programs, so I end up having to actually send my audio through my TV via HDMI, then using an L/R channel to 3.5mm splitter cable, and I plug my headphones into that. It's all very silly, I've got to deal with it because the jack on my laptop broke. My DDJ-SR also has a 1/4" microphone jack, which I use with my SM57 when I need it. The DDJ-SR shows up as a recording device as well, so I end up using it to record stuff. The whole thing is weird and frustrating, but I don't have the money for the proper devices I need, so I can't complain while I at least have something.
But yeah, I use it to DJ. I got it as a high school graduation present, even though I had absolutely 0 DJing experience. For some reason I was a natural at it. I've been in a few online radio shows/events already, even though I've had it for a single year. There's another one within the next week and then another one next month that I'm going to be in, as well. Unfortunately I don't play the kind of music you'd find at a normal club, so I can't really use it to make money by performing live.