Hey there, the SCS.4DJ performs very well out and about. I have used it twice in the last two and a bit months to play out live at outdoor trance parties, and it performed solidly! With the new version of SC-IX (V4.0) they have really made the unit a solid choice for any DJ to play out live. It is so handy to arrive at a gig knowing you have, for example in my case, 70gigs of MP3's to choose from to play your set. Gone are the days of swapping out records and CD's... just select your tracks from either the playlist or browse feature and you are good to go!
I will say one thing (which is more associated with previous version of the operating software for the SCS.4DJ) and that is my output volumes are quite low when I play out. This is not so much a problem of the actual SCS.4DJ itself (although it was kinda up until SC-IX V4.0) but rather caused by the MP3 auto-gain software I was forced to use as I had the problem whereby tracks would often volume clip and distort when pushing the channel sliders all the way to the top. I found a work around in the past, by using MP3gain (
http://mp3gain.sourceforge.net/) to normalize all my tracks which alleviated the clipping problem, but gave me another small problem of the master output volume being significantly lower than before. In saying this though, it is never too soft that the volume cannot be compensated on the mixer that I plug into... all I do is push the channel volume right up and presto! It's fixed
Please bear in mind though that with SC-IX V4.0 it gives you the option of MANUALLY adjusting each channel's separate gain, which is a huge difference as compared to previous versions of this operating software. So the small problem I was having can actually be avoided totally. So in saying that, to sum up... get your hands on a SCS.4DJ. I was pleasantly surprised with this unit, and I am sure you will be as well

Hope that helps ya in your decision.