I used to think the pro was very close in terms of enjoyment but after last night playing another pro on location it really is a lesser game.
The mummy lock is such a better experience with the real lock. When you start mummy on the pro it launches another ball into lane and on the prem/le you get to physically knock it out and its really alot funner and cooler looking start to the multiball.
The middle ramp is different,its like angled slightly higher in the pro and seems to shoot even easier then the premium.
The second captive ball is just more satisfying to hit then a target.
Shooting into the left ramp diverter tunnel to get sarcophagus lock or pharaoh's tomb award is actually better then I expected and probably more satisfying then the pro.
Starting modes is not a big thing but on modes like Mariner it just feels better to start the second ball with a shot under ramp then hitting the target.
So yeah supper happy I spent the bucks on the upgrades, I believe they really do make it feel like a more fleshed out game. The pro is great if you never played a premium.