I've had a couple of days with my new LDS 15/6. It's the squat version, identical to Ukiah's except for metal corners. No tweet. Duratex. The fit and finish are 1st class all around and it was packed like a tank. Weighs about the same as my Epi UL2-310, around 45 lbs. Note this is a preliminary impression based on practice with and without the full band. I placed it on a stand about 20" off the ground and compared it to my 310 with both M9 and Shuttle 9 heads. Dingwall Afterburner 1-5.
I now understand what Kjung means when he talks about getting grindy mids from a traditional 2 way cab when the low freq driver is pushed (as in my 310), compared to the cleaner mids and bigger bottom that I hear from the 15/6. He can have those grindy mids

, I'll take the smoother, clearer mids, thank you. I didn't mess with the mid attenuator at all-just left it at its' "normal" midpoint. It was just as easy to hear myself as with the 310, but the mids are definitely clearer and cleaner. The bottom is fatter, deeper and wider than the 310, which is not bottom-shy in its' own right. This cab gets louder in both the mids and lows than my 310.
The Shuttle 9 sounds great through it, but I have to apologize for not spending that much time with the Shuttle plugged in, since the M9 sounds so much more punchy, powerful and deep through it. I know both are rated about the same at 8 Ohms, but the M9 crushes the Shuttle in terms of volume, even accounting for gain slopes. I was able to absolutely dime the Shuttle (earplugs mandatory) and was worried I'd shatter a window....but neither my ears nor the rehearsal space (aka my basement laundry room

) could tolerate the M9 master beyond 1 o'clock. Apart from the volume advantage, the M9 instantly and easily gave that incredibly pleasing chest thump I crave-this combination gave me the most gorgeous low-mid punch I've ever produced. The 310 is FS. I'll keep the Shuttle 9 for convenience, but since my gigs are sporadic, the M9-15/6 will see all of them and happily, luxuriously exceeds my nominal gigging needs

! I'll post again after my next gig in late April. For you real pros and regular weekend warriors, I can safely say that although this 15/6 may or may not not equal a 410 in volume,given enough power it surely goes lower, louder, cleaner than the Epi 310. At around 700 this cab is not only the best I've played yet, it's also the best deal.