This GE Activator known as the "Straight-6" was designed primarily for a larger Mini-Basket with less consideration for the machine as a conventional washer (although I wonder if they didn't switch to this straight-vaned agitator to help them claim a larger capacity from less water displacement). You don't have to be a hydrodynamics engineer to notice that the 6 vanes on the bottom of this agitator are small and short while the 3 vertical vanes are large which isn't particularly helpful if you want a lot of rollover. The original Bakelite version of the Straight-6 was black and had small vanes at the bottom which were slightly longer and protruded outside the circumference of the Activator base (which might have helped a little). 

It'll still do the job but only if you don't overload the washbasket at all. The Spiral Activators did a much better job at muscle-ing large loads down, up and around.

You can replace this Activator with any Spiral version from the V-12's up to and including the "HEAVY DUTY 16's ( you just need to make sure that the internal spline is compatible with your Activator post)