I am always curious and interested in exploring different types of meditation cushions and benches. I have a couple of zafus (admittedly, one has a hole in it waiting to be repaired) and one zabuton. I have some sort of triangular cushion I picked up at Crystal Gardens that I haven't liked since the first time I used it. I think it's not well designed for heavy people or people with bad knees. It is very firm and at a steep angle.
I have a gomden and knee cushions. Those have been my mainstay for quite some time now.
While visiting a friend he showed me his meditation bench and I got to try it out. It is a small bench you sit on. You can cross your legs in front of you or tuck your legs under the bench. I like to sit with my legs behind me but on the outside of the bench. The bottom of the legs of the bench are curved instead of flat. I think this makes a huge difference in the comfort and support provided by the bench.
While using it I have found it easier to find the correct spinal position and to maintain it during my meditation. There is no strain on the back of my legs since the bench is tilted to fit the shape of my body.
I used it for my first 45-minute meditation a little over a week ago. I was surprised to find how comfortable it was. I look forward to many more sits with my new little friend!