I'm running the PSB Imagine Mini's out of a Woo Audio WA5. I tend to listen at slighty louder than speaking volume level. Not to say that these can't easily be cranked with the Woo. For my ear they sound fantastic. Very dynamic, precise, clear, fun speakers. Vocals are excellent. Highs are absolutely there. Bass is lacking as you expect for speaker this size. I've played lots of different music through these and they manage it well. Female vocals are clear and full (Adele, Carol King) Male vocals are likewise deep an full (Angus, Harry Connick, Neil Young, Marvin Gaye). Classical soundstage is good.
The closer you are the fuller and more accurate the sound staging. My listening room is 15 x 20. When right up on speakers (at desktop distance) the imaging is disturbingly good. Further out in the room, the sound is good, but image disappears. Never expected them to fill a large room with waves of sound. They make for beautiful atmospheric listening, and at times give you that head lifting what is going on response. All in all I would say a fantastic bargain.
Just for perspective when I was looking for a small pair of bookshelf speakers (with different amp) I compared the B&W 805D, Sonus Faber ($5k stand mount model), and PSB Imagine Minis. Clearly these speakers are in different leagues. I was prepared to lay out the $5k. That said, when I compared the value for the dollar, the PSB Imagine Minis came out on top by a long shot. They are simply that good. Don't get me wrong, I'm not saying these are speakers which should be considered side by side. I am saying however that a very rational argument can be made that these are a fantastic choice.
I enjoy them immensely and will hold these until I upgrade to floor standers. At that point these will easily find another place in a bedroom or office... Lets hope thats none time too soon.