I love my 2018 Diverge Comp with FS. The ability of the FS to take the edge off was very obvious, even with a short little test ride over poor quality asphalt. While I don't have the riding/testing pedigree like some of the folks around here, I'm in my 50s and have been riding seriously off and on since my teens, and I agree that the Diverge w/FS is the real deal. Fun, fast, and comfortable (I ride mostly gravel at this point). Of course, the upright position isn't for everybody but I like/need it.
I've since added 42mm Teravail Rutlands - running them tubeless on the stock rims & tape - and the combination is great. I highly recommend the bike and feel that much of the criticism is unjustified. But I do understand concern about the long-term availability of the cartridges. I'll just buy one or two to ensure I have them on hand, I suppose.