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I figure that sooner or latter everyone will upgrade to simplify3d. And I believe that if simplify3d had a demo of their program more would decide if it is worth the cost.
Though after the initial...

I use Cura 15.04.6 mostly. though i do use idealMaker and Slic3r quite a bit. The others were all free and had to check them out to decide what I liked best.

Here are several slicers

Craftware, Cura, idealMaker, Kisslicer, meshmixer, Repetier , slic3r, SolveSpace

http://blog.craftunique.com/craftware-your-free-software-for-3d-printing/...