I updated to WanamLite 10.5 earlier today, and man does the OS ever feel smooth! The browser and launcher (Apex) simply fly around like they're teflon-coated.
It's based on the new XXLPS Polish release, so I'm guessing that Samsung's latest changes are getting closer to a decent, stable state. I'll have to reserve judgement on battery life for a while, though. Still not seeing fantastic off-leash times on ICS roms yet.