As a user, I use superfly only. As a vendor, I make both superfly and firefly shaders. It would be nice if it was superfly only because the shaders are easier to set up, IMHO. With Poser 12 it's a toss-up as to which runs faster. I recently had firefly renders take longer than their superfly equivalent. And yes, it does take a while to make both, because you need to have the thumbnails and promo pictures for both.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
Check out my store here or my free stuff here
I use Poser 13 and win 10