Makes much more sense now, you fit the beats to the grid, which opens up a much simpler way of mangling and reordering your audio.
All you do is find the start of the beat, right click - warp from here.
If you then find the beat slipping, just hone in every 32 bars or whatever, click in a new warp point and bring the beat back in line with the grid.
Easy.

This makes it so easy to change the groove of your audio now, just click a point and shift it around in the grid. fantasic.