Well, as a current Apple Aperture user I'm eagerly awaiting any news of an Affinity DAM product release. I do feel they time is running out for Aperture which, fingers crossed, is still working for me, but for how much longer is anyone's guess....
I don't like the way Adobe screws every penny it can from it's customers, using it's position as a monopoly and the only real game in town (for now!) and find both Photoshop and Lightroom not for me.
As soon as Affinity DAM software is released I'm jumping and will happily try Affinity Photo as well. Come on Serif, I'm waiting and willing to part with my hard earned cash! ;-)