Orijen and NVI UP are very similar in size/shape, so I would assume no problems there. ZP is kind of an outlier from most kibbles.
Good to know, thanks! I mix ZP with Orijen so that's encouraging. I originally bought the Petsafe Healthy Pet Simply Feed for kibble but i absolutely hated it (terrible to program) so i ended up returning it and purchasing a second Feed and Go for kibble. We'll see how well it works out when we go out of town for 24 hrs here pretty soon.