I love audio physic speakers (have tried the Virgo 2, Libra, Scorpios) and have been very intrigued by the reviews of the Avantera. The problem is they seem very rare both in show rooms and on the used market, so it's hard to find impressions.
I actually heard them at the Toronto TAVES show a few years ago and remember thinking they sounded terrific, but I wasn't really familiar with them at the time, nor was I on the lookout for speakers, so I don't have a good memory to rely on. I also heard the Virgo 25s, both at shows and at my pal's house. I liked them quite a bit, but they were a bit more lean than I've heard from, say, the Scorpios, and if I remember properly the Avantera's struck me as somewhat more full-sounding, though clean and accurate.
FWIW...