Cool product! I wouldn't worry about the HN naysayers too much (very "just use rsync to a VPS"-esque vibe here). I think you should clarify on your site that the app is only required for setting up the block, and that your guests won't need it -- I knew that from using the NFC wifi feature before, but not everyone does, and right now centering the app makes it seem like everyone will need it. You could also maybe make a business-centric landing page? I think this would go over GREAT with coffee shops etc. Especially if you have the option to get a logo image engraved instead of just text. Not sure how possible that is with your current setup, though -- I know laser cutters can do an image, but it needs to be SVG or another vector format I think? Maybe you could use the Inkscape auto-vectorizer to do that conversion for raster images, though (it's usable from a script IIRC).<p>Cool business! Good luck!