Don't think the e90 ever had "business" speaker system. That's a name that's being attached to newer models.
There was base system, hi-fi loudspeaker system, logic 7/hk, and individual.
I have the hifi system, and overall, find it excellent. The only real limit is the lack of more precise EQ that the l7 system has. But considering adding one of these jbl ms2 boxes to fix that.