I've never used the Ilford product, mainly because the word "silk", in reference to photo prints, brings back memories of ghastly textured color papers from the 1970's.
The Canson Baryta Photographique, and the Arista II Baryta Photo are said to be extremely similar to the Ilford GFS, and may be the exact same product. I have recently used the Canson and the Arista, and can confirm that they appear to be the same.
Personally, I preferred the surface, and the more neutral color, of the Harman By Hahnemüle Gloss Baryta, but the H by H product seems to be perpetually plagued with severe curvature problems, which, as you know, are annoying when dealing with inkjet printers.
