Wilson had to upgrade the then WP6 with WP7
Two of my friends one a reviewer, who loved what they had with the 7's compared to their 5's and 6's were enticed by the importer with great change over price to "upgrade" their 7's to the new 8's.
Both tried and tried for 2 years to love the 8's as much or more than their old 7's but they couldn't. They ended up with the Alexia MkI as they said it was the only Wilson the was better than their old 7's when properly setup.
Cheers George