AOSP lockscreen

If you have used stock Android Lollipop you will know how well the lockscrren works. Swipe up to unlock, left or right for shortcut and double tap notification to reply.

Now on TW the lockscreen is just aweful! The big unlock 'block' when opening a notification, the lack of shortcuts and cheesy unlock effects.

Any way of getting stock lockscreen or alternative app that works without ads etc.