How has your experience been with 3D Performance & Emulators?

[Trinatek]

For those of you that already have your handsets, how has your experience been with the performance of 3D games and more intensive emulators? Have there been any games that have shown noticeable choppiness or sluggishness?

Edit: I hear that Real Racing is giving people trouble. Also - I'm a bit curious how its handling PPSSPP for people.