Product review (1 stars): UPDATE:  DIDN'T LAST!
UPDATE:  One of the wheels disintegrated after about a month, another after 3 months.  Not worth it - go with OEM.

Original Review:  These worked well.  I can' t imagine how much replacing the wheels myself saved over calling for service.

The replacement process is a bit involved and requires taking off the front and top of the dryer, disconnecting all of the electronics, and removing the dryer drum.  There are no special tools required.  I completed the task with a couple of screwdrivers, a ratchet and socket set and a few box end wrenches.  It would probably be helpful to have another person assist a few of the tasks involved.

There are a few youtube videos out there that should help you decide if you want to tackle the job of replacing the wheels and/or belt.

If you are up for the task of tearing your dryer apart, I definitely recommend this product.