I like and fly a Paramania wing. My last wing was the Fusion and my current wing is a GTR i have also tested the GTX. I loved the fusion it's a perfect intermediate wing and can learn a lot from it, but they have stopped making it. The GTX feels even better then the Fusion (more stable, faster,turns better). The fusion is based on older technology (Revo 1).
If it was my decision and I was after a second hand wing then it would be the Fusion, if I was after a new wing then it would be the GTX. Hope this helps.