I owned the Calderas for 4 yrs, and still have extremely fond memories of them. They are some of the finest imaging speakers I've ever heard. I wrote a full review of them with comparisons to Kharma and Talon speakers for Ultimate Audio just prior to the mag's demise. The review got posted on StereoTimes, and you may still be able to find it there.
The only two caveats I had with the three-box Calderas were the challenge of getting a proper tri-wire cable set for them, and optimizing the Calderas to get fully integrated, pleasing bass response. I ended up inverting the bass cabinet, bringing the side-firing woofers up under the mid drivers rather than near coupled to the floor. Your experience may be different. Make sure you bring them out into the room a ways for ideal imaging and spatial presentation.
They are definitely a member of my personal, speaker hall of fame. You got a smoking deal, and IMO, they are far better than the latest crop of AP speakers-- after Joachim Gerhard left AP.
The Virgo 3's are a good speaker, but they are no Caldera.
Grant