Reality does a very good job of converting materials from Poser to Lux, and has a very easy to use interface. To get the best results possible you will typically need to do some editing of the materials in Reality, but it really depends on the individual user.

It's also much easier to make minor adjustments to poses, etc. using Reality since everything done in Poser is automatically updated in Reality, ready to send to Lux (using Blender you would need to make the adjustment, export, import, and make/fix shaders for every adjustment). But using Blender you also have access to Cycles, which is faster than Lux.

For integration with Poser and ease of use, Reality would definitely get my vote (I'm glad I bought it). But the export to Blender option is free, and you will begin learing Blender which could be very handy as well. So it depends on your own personal peferences and budget.

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