Also be aware that there is a limitation of the keys you can control via MIDI. For example, the 1-8 step key notes can only control a specific range, as I have learned from my experience. But I'm sure I'm still learning. If you want more information on Korg products and the E-MX1 then refer to Korg Forums
The Korg E-MX in itself can produce great D&B material, but I find its best to pick and choose different machines and sounds and put them together.
Buy this instead of a synth? Yes and no. Yes it is versatile, but use it well with other synths. The E-MX is in essence a multi platform, all round electronic music production system but it works well when you use other machines like I said before. I would strongly advise to buy it, you'd be suprised on what you can achieve.
Hope this helps.