The iPhone app is terrible.

First of all, while in the old app you could at least log into your Matmid account, that option is now grayed out.

Second, when searching for a flight and once in the flight details page if you click the back button (within the app itself so not the browser back button) you get an error page (Error 400 - Bad Request...) which requires you to shut down the app completely (by double clicking the home button and pressing the app) as there is no way to navigate out of the error page.
Despite notifying them, and a couple a updated to the app since it came out, they have't fixed it.

It's just sad...