To me the ProAcs give the best combination of wonderful imaging/layering, true transparency/speed, midrange/vocal realism AND yet they are not fatiguing for long listening sessions. Other Brit speakers I have tried, while very good, are either too slow, too polite or they can be edgy if they try to be fast and super transparent.
I listen to jazz, vocals, some pop/soul - often rhythmic stuff with bass, but no headbanging stuff. The ProAcs are not rock or party speakers, but for what I listen to, they and the Quad ESL’s (requiring different placement) remain unmatched. Some ProAcs can be a little bass light in terms of quantity (not quality) but I have also learned to integrate in good Rel subs for a very solid bottom.
Other very important factor here is I discovered long ago to mate ProAcs with Audio Research tube amps. ProAc’s are developed using ARC tube amps (among others, I am sure) and the good ARC amps really control the speakers, give very good bass response AND give utter transparency with a good dose of tube magic.