Late to the party, but I did want to share :
I just bought a bunch of Diana Krall 45 RPM LPs. The first one that I listened to was "Live in Paris". I was deeply disappointed. The album sounds so much better in the standard 33 rpm fromat. The 45 rpm pressing is overly bright and analytical.
Dire Straits "Brothers in Arms" 45 RPM version does sound superb compared to the standard format.
Not sure how to distinguish a good 45 RPM LP from a not so good one. Clearly every 45 RPM, 180 grams LP is not necessarily better sounding.