I have owned smaller (D15) and older (R3.8) ProAc, I have also owned smaller Usher (BE-718) though I have only heard Mini Dancer 1 & 2 in show room both with diamond tweeters.
If ProAc still keeps its house sound, a bit warm, a bit sweet, and a bit dynamically constraint, I think Usher will sound quite different. Usher is more dynamic, bass has much more weight and heft. I assumed you heard the BE version, that tweeter never sounds harsh unless it was not driven correctly. BE tweeter is signficantly more resolving, it rivals top tweeters out there so front end equipments are important.
One thing I will point out, I do find Mini Dancer 1 more coherent than 2 and that's usually the case for single midrange/bass driver speaker. unless you have a huge room, I will stay with Dancer 1.
If ProAc still keeps its house sound, a bit warm, a bit sweet, and a bit dynamically constraint, I think Usher will sound quite different. Usher is more dynamic, bass has much more weight and heft. I assumed you heard the BE version, that tweeter never sounds harsh unless it was not driven correctly. BE tweeter is signficantly more resolving, it rivals top tweeters out there so front end equipments are important.
One thing I will point out, I do find Mini Dancer 1 more coherent than 2 and that's usually the case for single midrange/bass driver speaker. unless you have a huge room, I will stay with Dancer 1.