I just ran across these new FPGA families and wondered if anybody here has opinions about them. No parts available yet, but there is a Crosslink-NX dev board in stock for ~ $130. They seem to be the first FPGAs built on an FD-SOI process (28 nm) and claim "up to 4x lower power consumption." Their "big" part (39k logic cells, 56 DSP blocks, 2.5 Mbit RAM) is available in a 72-pin QFN, which I thought was noteworthy. It appears comparable to some of the smaller Spartan or Artix 7's for which the easiest package option is 1-mm 196-ball BGA. This could be really nice for applications where you don't need a lot of IO.
The "low cost" Certus-NX family is newer but appears to be the same dies. No QFN package listed yet but I imagine it might be added later.
Documentation appears somewhat thinner than that provided by Xilinx or Intel. No support forum (they closed it and ask you to open a support case instead
). For those who have used their software (Radiant), how does it compare with something like Vivado?