After many games on my LE, I finally played a Pro for the first time today. A few observations:
1) It definitely felt like something was totally missing, and not just the extra toys habitrail. I realized after a few games that I was missing the Expression Lighting. It's a completely different experience with the Expression Lighting! E.L. takes things to an absolute next level. If you can afford to add it to your game when it's available, absolutely DO IT. Granted, if you've never played one with E.L., you won't really know what you're missing, but I can assure you E.L. takes it up 5 notches.
2) The time machine ramp definitely seems tighter on the Pro.
3) I had to adjust my gameplay a little bit on the Pro due to the dead-end shot. On the Prem/LE (as you know) that shot has a VUK that sends it back to the right flipper. I will often use this my advantage during multiball: when things are chaotic, and since it's an easy shot, I'll pop one or two balls up thataway to 'stall' them long enough (via VUK/habitrail) to locate the other balls and figure out what to do next. I couldn't do that on the Pro (since they just bounce back into play) so it kept things chaotic.
All said the Pro is still awesome so it's still a win. Anyway, just a few thoughts to share with the group. Rock on!