I owned 3A Sigs for a couple of years, spent a lot of time fine-tuning their set-up, and got them to sound really nice. While not the final word in resolution or dynamics, they are remarkably organized, coherent and convincing, and deliver plenty of detail if properly set up. Almost every little parameter affects their sound, like how much you tighten the Sound Anchor bolts, as crazy as that seems, so you have to be willing to work them, as Tonyjack said.
At around $2K used for a thoroughly realized design that's time-aligned and almost-full-range with purpose-built, matched drivers and almost no cabinet-resonance issues, you really can't go wrong.
At around $2K used for a thoroughly realized design that's time-aligned and almost-full-range with purpose-built, matched drivers and almost no cabinet-resonance issues, you really can't go wrong.