Aqsis
Pixie
JrMan
3Delight
Pixar RenderMan

These are all renderers based on Reyes rendering algorithms.
Some of these are compliant with renderman standards.
Anyone had any experience with any of these render engines?

With Pixar RenderMan everything is clear it is the industry standard used for most of the produced movies.

I'm more interested in the open source products like Pixie, Aqsis and JrMan.
What functions do they have that renderman has and what they lack?
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Andyba, 3d artist
skills: 3d modeling, texturing, rendering, 3d character animation, compositing
3d software experience: 3ds max, Maya, Softimage XSI, Deep Paint 3d, Body Paint 3D, Wings 3D, Z Brush
2d software experience: Adobe Photoshop, Adobe After effects, Macromedia Flash, Freehand