first, anything I ever said that was negative about the Affinity products ... I absolutely rescind - as of June 2019, this is the best software available. period.
Problem is: having the iPad Air 2, wanting Designer for iPad, and a pen that will work with it.
Designer for iPad works fluidly. I got a Wackum (i know, it's on purpose) Bamboo Sketch Pen, the pen does work with the tablet, However: it is not designed to pair with the tablet, but with the software. yes, the software is required to support the Wackum pen functionality. This means that only a few programs will function fully with the pen. On their site is a rather short list of programs that are compatible with the full functionality of the Bamboo Sketch Pen.
Please, is it possible to add this compatibility to Affinity Photo & Designer for iPad / iPad Air? ( iPad Pro is out of my $$ zone, & Apple pencil has restrictions beyond price) ...
Thanks to the Affinity team for developing the current products