First of all, congrats on getting familiar with AWS! It's great that you've learned a lot setting up your site, and sounds like it's configured just the way you like it.
What I mean by better user experience are things like better gameplay on mobile, faster graphics.
My only experience with PM was playing on my phone in Krish's big giveaway tournament some months back, and it was pretty much unusable on mobile, compared to apps like PokerBros and PPPoker.
I have played likely thousands of hours (pre 2011) on FullTilt and Pokerstars and enjoy the user interface of the mobile apps a lot more than those, too.