Although I prefer entry on the Mac, the iOS version is better for tinkering on the couch or during a brewing session. Inventory, shopping and water adjustments all seem much more usable. Even though Ill probably never again own an iPhone, I can recognize that this being a universal app adds value for some. I thought the developer set an extremely reasonable introductory price for upgrades, and hope he makes enough to where continuing to improve this app is worthwhile.
My favorite addition to the Mac version was the "All Batches" view, since I number my batches. Id like to see this view make its way to iOS, but thats no reason to petulantly withhold a star. This is a very good tool for any homebrewer, especially as a companion to the Mac app.