What feels "mildly uncomfortable" becomes VERY uncomfortable the longer you sit on it. I would strongly advise you _not_ to pick any model that feels very uncomfortable within the first few minutes you spend on it.

We tried some of them at parties where they belonged to the fixed furniture in the play zones. It is not something I would want to have as a permanently available toy at home... they are just mean.

Even the models which would theoretically allow you to put your feet on the floor and thus lifting some pressure away can be used by tying your calves to your thighs; this way you have no possibility to escape having your full body weight pressing your pussy on the edge.

*shudders* Not one of my favourites at all.

As they seem to be popular at parties, I am sure you can find someone to make one to your instructions/likings.