I've played quite a few.
The Michael Kelley's are pretty, but did not sound appreciably better than the much lower-priced Deans.
I had an Ovation, it was just meh, mostly used in amplified, though.
At the NAMM show I tried a Klein/Taylor, it looked amazing, but... it was NAMM... the ambient noise at the show just obliterated the sound, still not loud enough to play unamplified.
I tried out a Fender Vic Bailey, it also looked cool, but again, not much output acoustically.
I have not tried the Thunderchief or the Warwick Alien.
Played several Carvins...tried hard to like them, but really no acoustic output to speak of. Just hollow feedback-traps.
I tried out Fender Kingman in NY last fall, it sounded less-than average, and felt really weird with the solid, heavy neck and the lightweight body, like the world champion of neck-dive. Weird, schizophrenic uncomfortable instrument.
One of the BEST sounding acoustic basses I've tried was a Martin at McCabe's... it actually had some balls, but it also had a pretty good price tag, as I recall.
The Takamine looks interesting... never tried one, though. Also never had my hands on an Earthwood, but the body size might actually give it a chance to develop a bit of acoustic oomph.
I don't think acoustic bass guitar is a very good idea. They're just hollowbody electric bass guitars "styled" in the manner of acoustic guitars. You still need an amp, unless you're just sitting on the couch in the living room by yourself.