You're really asking two questions here. One one hand, you're polling to see what we're all using. But perhaps more significant, you're specifically asking for "something brick wall that sounds really good". Two different questions, one with an easy answer and the other with a more complicated answer.
First, the easy answer to part one: I am using either Pro-L or Ozone, depending on the project. The former because it gives me more options, the latter because it gets excellent results very quickly.
The second, implied part of your query is a little more complicated: what brickwall limiter sounds good? That's a loaded question, because it presumes that a brickwall limiter imparts a particular sound. For
some people, that may be valid. For me, it's not. My expectation of a limiter is that ideally it should not color the final mix at all.
(Of course, limiting by nature always effects the sound of the mix to some extent. You are, after all, distorting the waveform. Distortion = added harmonics = coloring the mix. You are also raising the average RMS and reducing dynamic range, which is going to change the mix.)
When this question is raised in online forums, it usually means "what limiter will let me get away with the most drastic squashing?" If this is actually your question, then a) I am not the one to answer it and b) you probably don't understand limiters well enough to process the answer anyway.
That may have sounded a little insulting, but that is not my intention, Rod. All I'm saying is that the answer to your question is ultimately acquiring a deep understanding of how limiters work. I would not, for example, recommend Elephant or Pro-L to you because they both presume that you have such understanding. A simpler plugin such as Barricade might be better suited to you for now.
But if I've misread your intent and you're actually looking for transparent brickwall limiting for K-12 or lower finals, then Ozone's probably your best bet.