Product review (4 stars): Heavy Duty - time will tell
This coupler looks very solid compared to the standard one.  The standard ones usually last about 6 or so years (I tend to load the washer too much).  Generally the hard plastic parts break and these seem to be about the same.  The rubber part is much heavier.  I assume if it doesn't give as much it will not break the plastic as easily.  Seems to be good quality.