John
Well to be fair I do think the CW people did a poor job of explaining this. I believe they over thought it. They were trying to be very detailed and accurate which was too confusing for some.
Maybe they shouldn't have used the term "membership". Just announce the "new" Sonar (like Apple did with the iPad, not calling it iPad 3).
They inform us that after you have paid upfront the normal $149 upgrade charge to purchase your own copy of the product, you not only get the announced new features, but during 2015 you will get the normal bug fixes/operation enhancements, AND brand new additional features at no additional charge for 12 months! Like a 2fer sale!
Oh but wait there's more. You can also purchase this product on an installment plan! Just 12 easy payments of $14.99/month and the product is yours, and you get to use the new product while you are paying off the monthly payments!
Walt