The E190 is a great airplane for it's market. Very comfortable for passengers. More expensive to operate than the CRJ product with similar number of seats by about 30% according to our CEO. I fly on the Canadair side of United and they tell us that they have been very happy with both airplanes but that the CRJ is cheaper to run right now, which is why Delta put out a RFP yesterday to replace a bunch of their E170s with CRJ's. At least that's the way it looks like they are going to go, who knows.
One thing I can say about the 190, it's a big freakin airplane for a regional jet, I taxiied by one in Washington-Dulles the other day and was struck by how it was almost as big as the A319 parked at the next gate.