If you are a manufacturing business with assembly work, the MRPeasy is a great app. It integrates easy with Shopify and orders are seamlessly synchronised between the systems. We have just migrated from another software and we are very happy we did the swap to a dedicated MRP system. The UI is modern and intuitive and the logic is relevant. It is however a steep learning curve if you have little or no previous experience with manufacturing software. The online material from MRPeasy is great so it's a good advice you watch the videos and get a proper onboarding before you become frustrated.
I am currently transitioning from Katana to MRPEasy. While there have been a few issues with setup, this is to be expected with a complex ERP system. The support team has been extremely helpful with solving issues I have and am confident I will get everything up and running very soon. The software also seems to be much more powerful than Katana which was missing a lot of features we needed. Thank you for the great support MRPEasy Team!