I put in another thread that I find the US club at LAX oddly calming. Before a red eye it was very dark, quiet. And the agents there are the best there, they definitely take pride in their jobs and working for US. It's definitely not the fanciest but it's comfortable - in the daytime I could see liking it much less.

I also like that it's pretty hidden since that means less people realize it's there, and therefore less crowded.