I've used one. At my old company, they bought one just before I left to start this place. Curved ink wells that a flat flexible screen mounts into, forming to the curve. After the frame is mounted, we had to block out, seal all edges to avoid leaks. Then, a plexiglass top with a gasket and air valve is locked down to the top. It works, but it's a steep learning curve to get everything right. I'd rather make transfers...
Steve