A lot of the "bugs'" in the firefly renderer are actually a result of improper settings.

An infamous one if the AO "spots" bug, and a simple increase of the ao settings is solution.

And if you use AO, you don't need any of the old "nostril glow" fixes, because of the inherant problems in the P4 renderer.

So EF fixes the problem, improves the renderer, adds features, but people are too lazy to learn how to use it properly.

You'll never see a new feature laden renderer faster then an old one, because they always include new technology, and more relaistic render ability. You add features, and the "price" is a slower render. I can remember when UV mapping was being added to renders, and how many people complained that the rendering time took forever! Now we couldn;t live without uv mapping on objects.

We heard so many people lament that we didn't have ambiant occlusion, ibl lighting, and realistic skin shading, and now you see people complain they slowed the renderer down, and it's too complex.

The poserverse is the only graphic community I've seen anywhere that doesn't embrace advancements and crave more. Its kind of amusing.

I'll bet if/when EF enhances poser's rigging ability, we see people complaining figures are more diffficult to pose, and want to stick with the old method.

Way too many people take way too many things way too seriously.