Mine just arrived today. It's stunning. Light, compact... and the sound: clear, biting (roll off your mids to taste), and thick.
My Ampeg 410HLF cab will soon retire. It's a beautiful solid cab with lots of bottom. It still does the job and is great for players looking for lots of presence. But the Big One does the same, with more clarity.
I'm away for a week on Sunday, but will do a full review when I get back.
Lovely.
*Edit*
Before I go, I just have to add: this cab is amazing. If you get one, don't be put off when you first plug in. The big speaker is new and tight, so needs a couple of hours playing at high volume to loosen up and unleash its bass. The mids might seem a little in your face at first too. Just adjust your EQ a little. Keep playing. Then it hits you... the tightest, juciest, warmest and clearest bass sound I've ever had.
I can't recommend it more highly. I'm absolutely delighted. And no, I'm not on commission!
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I used the Big One at the Moonfest festival on Sunday. It was the best sound I've ever had live - and it can more than deliver the goods on a big stage. It's got loads of bottom, punchy mids, and crystal highs when you need them. I cut through like never before. In fact, if anything, I think I turned myself up a little too loud.
Since getting the Big One, I've had nothing but complements. It puts my Ampeg 410HLF cab in the shade. I can't recommend it more highly - with a 1000W amp or thereabouts, it's all you'll ever need in any setting, from rehearsals right up to big events.