Like most things, if this is handled well it could be great for the Eden brand and Hi-Fi sound. But if its just another corporate ploy for better bottom dollar, then it may have been a very unwise investment indeed. Neither company seems to have been terribly active in R&D in the past 5 years...if they keep production overseas how long can a company last off of their reputation alone.
Without a drastic increase in QC, or attractive redesigns I can't really see anything more than the marketing powerhouse of Marshall being a plus for Eden. I expect to see shops flooded with the next wave of a lower caliber Eden in the coming year. There could be opportunity for a great remodeling of the 300 watt tube head however. That would be very interesting indeed.
More than anything, this makes me excited to see the value of my USA made Eden skyrocket!