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I really liked this app, it's best if you are using this app by itself. I tried to use this app with another app and both wouldn't work together. it was then explained that only one app can be used to control the checkout process at a time. Well that's unfortunate, I would prefer to be able 2 use 2 apps at a time when it comes down to the check out process. I wanted my customers to be able to choose their customized options with this app, yet still be in a vip program with their own rewards from another app and I couldn't do both. if they can figure out how I can do both, I would gladly pay monthly again for both apps.