Product review (5 stars): Don't be afraid to change your door boot gasket.
This gasket was a perfect replacement for my LG Steamwasher WM2487HWMA front loading washer.  Apparently the development of black mold on the door gasket is a common problem with front loading washers.  From what I have researched, it is a combination of people closing the door after use (not allowing the gasket to dry), using HE liquid soap which has animal fat and products that act as a substrate for mold growth, and not running an occasional really hot wash with bleach.  With that being said, it was time to change the gasket on my washer.  I obtained a quote from a local repair service that was highly rated by Angies List.  So the quote comes back at $300 which is about 25% of what we paid for the washer itself.  Not a bargain if you ask me.  The internet being the great source of information that it is, yielded a step by step video on how to change this gasket (youtube search "Door Boot Seal (part #MDS47123604) - LG Washer Repair".  I opted to also purchase the spring removal tool (LG Electronics 383EER4001A Washing Machine Outer Tub Spring Removal Tool), which is the tool with the straight jaws, and not the 90 degree bend.  The door seal and the tool together cost around $140.  The replacement was so easy and took less than one hour.  The only other tools you will need are a pair of pliers, phillips screwdriver, and one zip tie.  Thats pretty much it.  Go for it you can do it and save money in the process.