I did try it out at work yesterday with some recorded music. When I first fired it up, I have to admit I thought I had screwed up. I chose the 3015's instead of dual HL10'cs, and it just did not seem to have that feeling of authority that a pair of t24's loaded with HL's had. At that point I was wishing I'd gone with the duals, or stayed with my t24's.
I went to the gig with a real kludge of a setup. A peavey xrc600 driving the mains,



Bottom line, I've used both. Bill is dead on with tubas for dj's, titans for bands. That extra few db in the middle of the passband makes a huge difference for live. But if I were a dj, or a band with lots of low energy synth, I'd do tubas.
This was my first time out with the omnis, except for test and tune. They are used in my rental rig. (Which is the XR600c). They were easy to eq, (little feedback @250 which I pulled out), and sounded great. Vocals were crisp, clear and easily over the top of two very loud bands. When we miked the instruments in the second band it was detailed, and clean. Bottom line, DR250's are better, lighter and cooler. Omnis are no slouches, and a much easier build. If DR's didn't exist, they'd be serious contenders for the king of the hill in a small cab.
I thought I'd post this here first and move it to reviews later.