If your Poser 10 is stable as a rock, you don't make comics, you use a content library manager like PzDB, and you're perfectly happy with Firefly rendering, then... stick with Poser 10. But I'd suggest than having Poser in 64-bit alone is worth the upgrade, for those on a modern PC.

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Learn the Secrets of Poser 11 and Line-art Filters.