Thanks, sil. I'm genuinely interested to know what you like about APP. I will get around to trying it myself one of these days but I have too much else on my plate right now.
I don't think that PI (or anything else) is the one true astro processing application. We all have different preferences and ways of working. Folks that value simplicity and ease of use are generally not going to be huge fans of PI
I don't care so much about that, having started a career in computing during the late Jurassic, and I'm happy to climb steep learning curves if I think the results justify it.
APP shows promise and I think there is a niche for a processing package that combines ease of use with enough power to produce good results. As you said, a bit of competition could be good for all of us users.
Cheers,
Rick.