This throne is the complete package.
The seat itself is very comfortable, the saddle seat is looked down upon by some, however because of how wide this seat is, it feels way better than a round throne. The foam is perfect, not too squishy, not too hard. Don't worry about buying the fabric, as they are all comfortable.
The base and the legs are heavy-duty stuff. They weigh quite a bit, and I am sure you will never find anything collapsing as the build quality of the base is as sturdy as it gets.
The backrest is a great addition, it is resistant, I thought the size of it would make it wobble, but it stays in place and it is pretty comfortable. It does not get in the way of your playing and your arms, and I find myself leaning back on it quite a bit sometimes when I want to rest my back. It is not too big however, so don't expect for this to feel like a padded office chair or a couch.
Definitely the only throne I will use from now on. Maybe if it breaks in 30 years, I will buy the same one.