I'm one of the ones who's impressed and intrigued by Douglas Tate's Renaissance chromatic, and actually got a chance to play it.
The slide is a joy - solid and smooth, made of steel about 1mm thick. It has the feel of something that will always work well. And it's fast.
Doug can get an absolutely screaming sound out of it, and can bang out some big, punchily articulated notes. I was afraid to try that, it being an expensive prototype and not mine. But I did note that it felt powerful, and had the curious feel of being both ponderous and flexible in action at the same time. And the reedplates hadn't even been properly set up at the time.
I'm one of those players who hears warmth in the sound of a wood comb, which I generally prefer. That' isn't going to happen with this all-metal instrument. And the coverplates had been plated with sound-deadening chrome instead of the desired silver or the agreed-upon compromise of nickel (the platers made a mistake and it was too late to correct before coming to SPAH), so the sound could not really be judged.
Due to the leakiness endemic to wood-bodied instruments, wood players often tend to blast. I didn't feel the need here, as all the air is very efficiently channeled to the reeds. The internal sound chambers are minimized in size by ramps. Recent discussion here leaves it open as to whether the sound gains by the extra compression (certainly the speed of response must) or loses from the smaller sound chamber. Hard to tell.
Would I buy one? At about $3000, that's about 41 #270 chromatics at current discounted pricing (I understand that there will be a lower-priced model as well). But this is a lifetime instrument and delivers more power and better slide action. Replaceable reeds, no cracked combs. Hmmm. If I could get that big, dark, warm bellyful sound I can get from a Super 64x or the delicate sweetness I hear in a 270 . . . When you see me starting to sweat and mutter feverish objections as to why I cannot possibly buy this instrument, you'll know that I'm hooked and Doug is reeling in the line.