I play Kings of War quite a lot and I really like it as a rules system (I vastly prefer it over Age of Sigmar to be honest) so I thought to take a look at Warpath as well...however they couldn't have launched the game at a worse possible time. Due to Mantic delaying the release, it came out simultaneously with 8th Edi...which pretty much killed Warpath from the get go. I don't know anybody who plays it in my area, and most tabletop shops around here have already started to sell Warpath models, even the stuff that was recently released, with a discount.
I do however have some Warpath models that I use for
40k. I use GCPS Ranger infantry as Tempestus Scions...
and CGPS Mule Transports as Taurox.