One of the comparisons I was really looking forward to was the NV115 versus the one-off 15/6 Jim built. This is a classic case of ported versus sealed enclosure, but it also highlights a 6" B&C driver in the 15/6 that goes a lot higher than the Eminence 6" driver in the NV115.
As expected, the 15/6 is definitely bigger down low and louder, overall. The increased high frequency extension is also readily apparent. If you had an amp which could use a little help in the low frequencies or in overall volume, this cab would be a godsend. Steve didn't care for the more extended highs, though I think I slightly preferred the extended reach up high. This is definitely a personal preference issue, versus one being better than the other.
By comparison, the NV115 (unless otherwise specified, I'll be referring to the cab with the newer Eminence 15" driver) was more tight and controlled in the lows, and more focused and articulate through the mids. This is not to say that the 15/6 isn't tight or articulate. It is - for a ported cab. But this showdown really highlights what a sealed cab can bring to the table. With only one "point source" for the lows (versus two in a vented/ported enclosure - the driver itself and the vent/port), there is no overlap or cancellation going on. Walking around the room, and moving up and down the neck, the lows and mids stay consistent, solid and articulate with the NV115. With the 15/6, you those two sources for low end output certainly combined to create more inconsistencies (both peaks and valleys) in the lows to low mids.
The NV115 absolutely presented a more even, balanced, articulate tone from top to bottom than any other cab we compared it to. This also involved the transition from the 15" to the 6" driver. This is always a strength of Jim's, and the 15/6 does quite well in this regard. But the NV115 shows it up in this regard. It really sounds and responds like a single-driver cab.
So, that's two of my "Bergantino Idols" (the NV215 and the one-off 15/6) knocked off their perch by the NV115. Wow!
I have mixed feelings as to whether or not I should have brought the HD212 home for this comparison.

My general thoughts are that there are folks who will prefer a ported/vented cab sound, and there are folks who will prefer a sealed cab sound. Among the ported/vented (non-powered) cabs I have tried, the HD212 is currently my top dawg. Among the ranks of sealed cabs, the NV115 certainly seems like it's destined for my top spot - but I won't make that call until I've had one for a while and gigged with it.
Compared to the AudioKinesis Hathor, the NV115 clearly has a lot more going on down low, and it's definitely bigger and louder sounding. The Hathor does a great, great job at transmitting an overdriven tone. In fact, I think it's in a class of its own in this regard, and it manages to present the texture of your grit across a broad frequency range like nothing I've heard before. But when you switch back and forth with the NV115, the Hathor definitely sounds like it's lacking in the low end. The rear-ported Hathor does a good job of sounding like a sealed cab in the lows, it's just a bit more truncated in the lows than I'd prefer.
Moving on the Baer ML-112, the Baer impresses with its high end clarity and with its strong and deep low-end. It's definitely a cab with more peaks and valleys (intentionally so), and the NV115 really points this out in an A/B comparison. Like the 15/6 comparison, the differences between ported and sealed designs were quite apparent. The ML-112 in its horizontal orientation sounded more like the NV115, but once again, the NV115 was more even and solid throughout its range.