What's interesting about the X is that our phones use that email app, but since our phones aren't Nexus or Play Store devices, we can't get this app via the Play Store.
However, if you follow that story you can sideload the APK. If you do so, you'll end up with 2 "Email" apps in your app drawer. For me, this app fixed a number of issues and seems quite a bit faster. Also, the UI has been revamped a bit in line with the other Google apps.
If you're a non-Gmail email user, it's definitely worth checking out.