I’ve got a One9, the singlespeedable version of the Air9 which I use for the xc type rides although I’m thinking of selling it (large, black, X0, CK, XT if you’re interested!) and getting a cross bike.
Finish is great, seems to fit me really well although this is obviously a personal thing and with 100mm forks on it’s not too XC focussed that you can’t ride more technical terrain.
Niners have always been relatively expensive, small brand, small importer, not many around etc etc so you probably could buy a better specced bike for the same money if VFM is the be all and end all.