Quote - Trust me, try a metropolis light transfer renderer (indigo, maxwell) and you may get fantastic accurate results, but it feels like running bryce five on a 486.....

 
O.k. I did try Kerkythea.
I did some renders with moderate AA (3x3), photon counts (100,000), and the Final Gathering on (900 rays). It wasn't so bad. I did a couple renders with the cornell box that came with the renderer.
At 800x600 it took 1:32. I would probably use higher AA setting for a serious render, so maybe double that time.

It's free.
I think It would be a nice addition to Bryce as a plug-in renderer. Maybe when the SDK gets out, somebody will write a plug-in for that.

Friends don't let friends use booleans.