Product review (1 stars): Terrible design.  Use grease, and find the new authentic part instead.
Feb 2013 UPDATE:  I replaced the recently replaced units AGAIN, and the non-broken side was failing, and the broken side was filing in a place other than the place that failed.  But, I followed the advice of those who say to grease the pulleys (grease, not oil), and this eliminated any noise.  I just hope it holds until I sell the house.

Also, if I needed to, I'd look carefully  at the recent post that talks about an original Whirlpool part with a new design.  They obviously know that their old design it terrible engineering, so a replacement with the straight cord configuration would be unsurprising.

Before I buy a dishwasher, I'm going to be looking at this feature on a floor model.  And I'll look at many alternatives before buying a $1000 Kitchenaid/Whirlpool again.
----------------------------------

I was worried after all the negative reviews, but this installed easily, and works perfectly, even better than the original version.

UPDATE: I did the second dishwasher months later, and it had the terrible creaking sound that my lubricating efforts failed to solve.  I solved this by keeping the original puller parts in place, and using only the new cord assemblies.  There is nothing wrong with the original version, where the cord rubs, because the cord never breaks where it rubs.  It breaks (4 times out of 4) at the plastic end of the cord, which is a terrible design, as the cord rips away from the plastic easily over the years - hint to Whirlpool engineers - have the cord enter the end piece STRAIGHT, not at an angle).  This part, AND the replacement are DESIGNED TO FAIL.

Another UPDATE: the recently replaced one on the groaning dishwasher BROKE AGAIN! I'll never buy Kitchenaid/Whirlpool ever again.  What follows was written before this disaster.

I installed it in a Kitchenaid top of the line from about 9 years ago, with a very heavy cabinetry front panel.  The install was straightforward (but you do need to disconnect water, drain, and electrical to pull it out enough to do the job).  I installed it in the middle of the three hole options, and the balance was perfect (better than before).

I didn't need to add length (it is shorter), but it helped to have a third hand to help connect it while stretching the spring.  In one dishwasher, I used the middle position, in the other, I used the rear holes to accommodate a shorter cord.

I was amused to find that the second side broke a week after the first, even before the repair was done.  I should probably get a spare for the second dishwasher's inevitable failure.

Incidentally, the failure mode was when the plastic button on the end of the cord broke.  An old fashioned knot and bead would have lasted a lifetime, but Kithchenaid/Whirlpool saved three cents in assembly labor.  The cord itself did not break, so there was no fault in the "non-rotating wheel" design that generates cord friction (which helps avoid door movement when set at an intermediate angle.  The cord showed a little wear, but probably had 10 more years of use in it.