In contrast to s-pugh's post I thought this was a good listener. The frustration of understanding what was going on came to an end eventually, in a fine PDM, and while few of the thematic answers were known to me it was not at all difficult to track them down. Also, since we were told that the ninth example was an "instruction" then it was not really hard to track down with specific example was meant either (so far as I can see, only one of the examples can be interpreted as any sort of instruction), reducing the grid-staring phase there too.
Just over a week ago I gave a talk about these sorts of puzzle to various of my fellow colleagues. Fairly well-received, although I doubt that any of them are likely to take Listeners up in a hurry -- as many commented, correctly, the learning curve is rather steep (particularly to access the finest examples). But this offering by Aedites is at least closer to the shallower end, I thought. Tough to get going, but once you spotted what was going on the journey to the end became manageable.