I think it's great their offering Bryce Pro free as it gives users access to these features not available in the standard version:

• 4 new lights
• True Ambience optimization
• Influence (Include/Exclude)
• IBL: light from inside
• IBL: Cast shadows - softness, and intensity
• IBL: Specular map
• IBL: Background DOF
• IBL: HDRI transaprency
• IBL: Export Image
• IBL: Tone map
• Materials lab: Displacement maps
• Rendering: True Ambience
• Instance Lab

Beginners tutorials for Bryce

Bryce Arena