Synth engine is poor. File system is nightmare. Then I resaved all them in proups, 50-60Mb per bank, and all these samples took only 1.1 Gb. 10 No onboard samples means no sense to rate this category. As for those 9, which come in the box, I find them insufficient.
Acoustic emulations are excelent, although all quite repeatative.
At this moment I've collected almost 200 sample CDs, covering all genres of music, and I must admit that my new roland xv3080 beats all them together for the sound quality and variety. And acoustics, of coarse. As for those who writes new age, trance, techno, ANY decent synth is a much better deal. Don't buy EMU producer series CDs - they are shit. I see how boring and poor E4 in terms of sound variety.