I use this in an unorthodox way. Its mostly to run my master signal a bit to hot through it to add some pleasing saturation. Especially brilliance in the highs and low mid thickness is added.
This unit emphasises on sound & build quality, for which Allen & Heath are infamously known for. It comes with no tacky gimmicks and it's a real audiophiles' mixer. It has independent sends and returns so you can use external FX units, like guitar delay pedals etc.
The Precise 4 band EQ is useful in a studio situation for precision mixing but for DJ'ing I don't find it very practical. You cant do nice 'bass swaps' like you can on the Pioneer DJM-800.
BUT it has its lovely analogue filters that give you that warm punchy Berlin techno sound.
What lets it down for me is that it doesn't enable you to listen to the cue and bleed in the master to your headphones like you can on the DJM-800.
There doesn't seem to be a way to be able to use sends and return with external FX at the same time as using the filters, its either one or the other which is fustrating.
If your passionate about sound quality then you should put your trust in this good bit of British engineering design.
The first of the Xone series, its pseudo-prototype status shows in the layout taken from their sound desks and the fact the filters have to be assigned to the crossfader channels. Built like a tank and very flexible.