I am a huge fan of the Audio Physic line. I once owned a pair of ML Quests and have heard the Prodigy and they are great speakers but I definitely prefer the Audio Physic speakers. I have never heard the Avanti but I have heard the Scorpios many, many times and have heard a few other models including the Caldera, and all of the upper end AP speakers share the same strengths. Those strengths are imaging and soundstage, simply stunning and the very best I have ever heard regardless of speaker type. Cohesiveness is also another strength of the AP line. They sound very integragted between the lows, mids, and highs, very seamless which I find even the newest ML hybrids just can't compare. I still hear a little discontinuity between the dynamic woofer and the electrostatic panel of the ML hybrids. They have gotten much better with this over the years, but to my ears it's still there. Weaknesses of the AP line. Well, despite their diminutive size the upper end models really prefer a large room to operate in. This is due to the fact that they really need to be well, well away from all room boundaries to get the very best performance from them, more so than almost all other speakers, and space farther apart from each other then almost any other conventional multi-driver dynamic loudspeakers. Performance wise they are maybe not the last wood in dynamics, although they are quite good in this respect and this improves the farther up the line you go.
