Went on this earlier and I can proudly report that this is an amazing ride. It's a bit rattly going into the inversions but overall this is generally very smooth. The airtime hills both give huge amounts of airtime which I never expected from it. Plus, the staff on the ride have to wear special Smiler uniforms which make them look like Oompa Loompas!
Overall, an utterly amazing ride that deserves the 2 hour queue it had all day today.