A lot of people aren't real happy about the upgrade costs, new collection designations, and the money they'd have to spend to use all of the L5 functionality they had in L4.
Don't panic and don't throw Logos under the bus!
There will be a free engine and minimal crossgrade coming!
We don't know when. We don't know pricing. We don't know how it will calculate features.
Be patient. I'm waiting too. I won't upgrade until I see all my options, including the minimal crossgrade. Maybe you're in the same situation I am. If so, wait. Patience is usually worth it.