One problem that the evasi0n jailbreak have is that it installs an old version of Cydia. But that problem is already solved thanks to the developer responsible for Cydia, Saurik. Two days after the iOS 7 jailbreak was released, Saurik released an update to Cydia to match its iOS 7 design.
Updating to the new Cydia 1.1.9 is very easy. All you have to do is open up Cydia on your iOS device, and a message will pop up asking you to do an update, just select Upgrade Essential. After updating, your Cydia will have a new look.