I haven't lost any of this.
I installed iOS 7 on my jailbroken iPhone 5 (iOS 6.1) and I've had no issues with slow Internet speeds or cell issues. The only thing I have an issue with (besides some of the icon designs and color scheme) is the battery life. It seems like notification services is being used a lot more the it was before which kills the battery. Also, in poor coverage areas, you can kiss your battery goodbye and say hello to a wall outlet. I have good coverage here on vacation in ocean city (4 to 5 bars of LTE) and have used HDR Pro, Snapseed, Instagram, tumblr and Facebook religiously and actually have battery left.
Can't wait for the second beta to be released. I've noticed a lag / freeze when using phone and either adding contacts or listening to visual voicemails. Also, when certain apps have services they ask permission for I've had to switch to the home screen (or something else) then back to the app to approve or deny the request.
PS...Apple, PLEASE ADD A FIVE ICON DOCK AND THE ABILITY TO RESIZE ICONS!! Thank you!