OK, I'm loving much about iOS7, though have mixed feelings about the flat UI. But there are two things which, as a usability nit-picker, have me really bothered: 1) One complaint I had with my iPhone 5's taller screen was that reaching the back button in the top left corner was difficult when holding the phone comfortably one-handed. I'd have to reposition my hand a bit. So I like the change to just swipe anywhere on the screen left-to-right to go back. The problem I have is that it's not consistently applied. Now, I can appreciate the dilemma the developers were faced with. For example, in the photos app, we've grown accustomed to swiping left-to-right to go to the previous photo, and that felt natural and good. But I'm of the opinion that they need to go all-in on the new approach where swiping left-to-right brings you to the previous application screen (i.e., whatever is referenced in the top left corner). Otherwise, it will be difficult for my brain to adjust to the point where it's "automatic" and muscle memory kicks in with predictable results 100% of the time. So, some of the built-in apps that are inconsistent with this: - Photos app. Very mixed bag. When viewing photos, left-to-right swipe displays the last photo in the list. When looking at photos and lists of photo categories, left-to-right does nothing. When clicking the 'Albums' icon at the bottom, the list mode of Album categories (e.g., Camera Roll, My Photo Stream, etc.) allows for left-to-right to bring you to the previous app screen. - Safari. When viewing a web page, left-to-right brings you back to whatever web page led you to the current page you're looking at (like the "Back" function in a desktop web browser). If they're not going to go all-in with the new approach, it might be better for them to abandon this new approach altogether. Tapping in the top left corner is still problematic, so perhaps adding a "Previous Menu" icon in a menu bar at the bottom of the screen would be better. That brings me to my other complaint... 2) Inconsistent placement of app menu functions. I'm seeing three variations: - Some apps put menu functions in the top, including the top left where you are accustomed to seeing the name of the previous app window (related to the discussion above). For example, in the Messages app, in my list view of emails, there's an "Edit" button in the top left. - Other apps put graphical-based icons in a menu bar at the bottom, with the bar disappearing sometimes and re-appearing if you tap at the very bottom of the screen. I'm talking specifically here about Safari. I like the fact that the bar disappears and can be easily brought back, but some of the icons are cryptic. - Others put text-based menu functions in a bar at the bottom. For example, the Calendar app shows me three menu functions at the bottom: Today, Calendars, and Inbox. This bar stays visible all the time. On a side-note: this look brings back nightmares of the old Windows Mobile UI, but it's actually pretty usable.