Product review (3 stars): Like the original, but they seem more bittle.
This replacement works just like the last few.  We are probably around the 8th drive on the last three blenders.  The current ones seem more brittle and fragile than in the past.  This appears to really be Whirlpool /FSP OEM quality, but are still not very durable when chopping ice and frozen fruits for smoothies.  Note that you will need a special tool or a VERY THIN wrench to slip under the drive and hold the motor shaft to remove the old drive.

For some of these after they shred and die, you can just bend up the metal base plate to get to the motor shaft.  Due to the left hand threads it will tighten itself as it is used so going back on is not a problem.

I wonder if all of these were manufactured 10+ years ago and the plastic is aging due to outgassing and chemical breakdown of the material...