ProAc D28 vs Usher Dancer Mini 2

The Usher's use much high resolution drivers than what Proac uses. With higher resolution comes setup issues, so your dealer may or may not have optimized how the speakers were setup.

If the speakers you heard had any other speakers in the room, that can lead to lumpy bass, also if the speakers were too close to the read wall, or if the room has problems with standing waves this could all lead up to lumpy or boomy bass.

As per treble, good clean treble requires the right components, cables, power conditioning, and source components.

If the speakers are very revealing that you will hear both the good and bad aspects of the recordings you are playing.

Many dealers are not the best in setting up their own demo rooms, this can be due to the huge costs required to find just the right group of components that will make a particular set of speakers come alive.

Trust your ears if you were impressed buy the Ushers they are really fantastic speakers.

I agree am also a fan of the Proacs and sell them at Audio Connection.
Having heard all generations Response 3 series
I think the newest D38 with UK made Volt drivers are truly special and offer a sense of engagement like never before.

The new bass loading system,advanced Cabinet design bracing support easier room placement and makes these speakers disappear as if not in front of you.

Piano has an unique natural tone that holds on just long enough to the notes yet has a spooky immediacy.
David Gilmore's guitar on Pink Floyd Division Bell has an on fire energy and flows out with an effortless powerful quality while still remaining cohesive at all times.
The D38s as proacs before have a sense of musicality that leaves many others speakers sounding mechanical forced or etched.
Please let us know when you audition.
Best Johnnyr

Man, you guys don't make this decision any easier. I guess I can't go wrong with either one.