Product review (5 stars): Fits good with use of supplied O-ring
This filter will replace the GE brand MWF if you use the supplied o-ring. I first installed the filter without the o-ring and it did leak all over the place. The supplied o-ring does not replace the existing one in the fridge! Instead it just rests in the top of the filter, so when you're done installing it, you will have added one more o-ring to your system.

Once I figured it out it worked great, no leaks.