I demoed it recently. Until this I have jumped mostly Sabre2 (190 for the first 400 jumps and 170 sqft for the last 400 jumps), and S Fire of similar size (169 sqft) is a lot more agile and responsive. It was really fun to fly, and easy to land. Turns were quick and overall it was faster than Sabre 2.
But because of the quicker turn characteristics I think it could cause line twists more easily when jumping with a wingsuit. And I mostly do wingsuit jumps so at least for now I will stick with the more docile Sabre 2.