Lockdown pioneered the mesh tracker in After Effects but now that other mesh trackers are being announced we made a video that discusses the comparisons. Includes bonus tutorial on how to create the face depth map used in the comparison.
The latest version of Lockdown adds Alembic support to be able to use the track data from Lockdown in a 3D app like Cinema 4D to pull off crazy tracks like this one of trees growing on the rhino's skin!
Getting the perfect key usually involves pulling multiple keys with different settings and then mixing them back together. James from Plugin Everything explains why they created KeyMix to solve this problem.