I have the Grill Grates on a Portable Kitchen PK Original.
They do a good job, but I hate them. They are difficult to clean. The words Difficult to Clean doesn't really do justice to what a pain they are.
They also don't stay interlocked together, they fall apart. I see some people use bailing wire to keep them together.
The steak competition guys use them, but that doesn't mean that they are easy to use.