I got the Gaia II for my ProAc D48R today and installed them a few minutes ago. The changes that I noticed were:relaxed presentation, sound stage expanded, pin point imaging, better definition of overall music. And stable sound stage - very noticeable. One important observation was - even at low volume there is details and you don’t have to strain to hear what is going on.
The thing that concerns me most is that, on the footers the speakers wobble when you push them. On spikes they were rock solid. Hopefully I will get used to this. But overall, I am glad that this tweak worked for me and the money is well spent.