Having used Constant Contact for many years now, I can't believe that anyone could think the new interface is acceptable. When importing from a file, the contents of the fields are so greyed out that it is almost impossible to see what they say. Bizarrely once you select the category name for the fields they become clear in heavier print. If anything this should be the other way round. It is extremely tiring and tiresome to look at when it is almost invisible.
In addition with one file I imported, the display included an out of place field from later in the spreadsheet in just one location. I retried 4 times trying to spot anything that might be throwing it but couldn't find anything. This leaves me worried whether there were other things I couldn't see which might leave the database inconsistent.