Go Contacts EX offers more useful features than you can imagine, but should slightly improve the way it looks. You can change its layout with themes, but you still might feel like something is missing when it comes to its appearance. If you don't care how your contacts app looks, then you'll definitely enjoy the added control this app gives you.
This application comes with its own dialer app that shows up as another app in your application menu. It can be accessed from inside of the main app, as well. Go Contacts EX is one of the few apps that doesn't look as good as Android's default contact-management application. You can download multiple themes to make it look better, though. The app's dark theme does have good color coordination, but it still looks a little goofy. The app has more features than you'll ever need, though. It includes a batch delete for contacts, several easy ways to merge your contacts, and the ability to group your contacts. It even lets you clear your call logs and back up your entire contact list with relative ease. You might even like the big buttons and other layout quirks this app offers.
If you don't mind the layout, you'll really like all of the nifty add-ons Go Contacts EX brings to the table. It's one of the most feature-packed contact apps on the Play Store.