Dies after 3-4 Months of Use
I've bought this item twice.  I actually love it for the size, comfort & adjustable heating but it just doesn't last.  This pad has no durability.  First the heating temperature starts to decline then it just dies by only returning the "F" error message.  Once that happens, there's no recovery.  The first one lasted about 6 months and the second lasted only 3 months.  I use it according to the directions and never use the damp heat option.  That doesn't help to preserve it for long-time use.  Both pads followed the sequence of failure I described above.  Sadly, I must strongly recommend against buying this product.
Rating: 2 stars