Man, there are way too many changes to easily list them right now.
I guess we really should sit down and detail the changes.
For one thing with the tech level number going from 0-600 it costs a lot less to upgrade. You can kinf of think of the level 101 is similar to being able to have 10.1 under the 0.21 tech level system. It allow players to spend less money as they get higher in tech by breaking it down more.