Do you already own a powercore?
What is your soundcard?
If you already own a powercore and your soundcard doesnt have issues with it, then the Virus Powercore is OK. There was sync issues and strange bugs reported on
http://www.powercore.noheaven.com/index.php so I would suggest reading a few topics there first
All in all I'm sure it's a good buy but it doesnt seems to work too well with the emu1820.