Audio Nirvana Drivers

Recently I had a chance to listen to the Audio Nirvana 15in Alinco driver, connected to a nice 300b amp. Quite frankly, I was blown away at what I heard. It was as if the speakers completely disappeared and the sound was appearing out of thin air. The vocals these things produced were incredibly realistic, the midrange was very fast and rhythmic, and the imaging was by far some of the best I've heard. The weak part of the driver was definetly the low end, but still went down to ~35hz. Not being in the audiophile game long, and still learning, I came here to get a few opinions. This was my first experience listening to a full range driver. Having no experience with manufactures in this area, I have a question. Who makes the best full range driver? Had anyone had a chance to listen to any drivers made by Audio Nirvana? Opinions?