Surprisingly terrific
It is expensive and heavy, and it happens to be a great seat cushion.  If you spend a lot of time in front of a keyboard (and I do), then this is a really well made and effective seat cushion.  The gel waffle form does not wear out like the other options I found (and tried) on Amazon, including other gel pads and cushions.  If you are getting too much pressure in one spot, you can adjust how it is feeling by sliding forward or backward about a half inch to make any part that is too firm lay down.  It never gets hot, and the black container seems tough enough to handle regular use.
Rating: 5 stars