One more point on this. Back on the original birds and moons, there were Xrays of both chambered and semi hollow guitars. Both were semi hollow, but the "semi hollow" had something like one additional small area hollowed out. That leaves the additional 1/4" body thickness as the main difference. I went through all of this in detail with PRS back when I ordered my first PS. I had no idea (and neither did most on B&M) at that time that there even was a "chambered" model. The same guitars were called both. It was not until my first PS came in, and I saw the body was thinner than my Artist 3 semi hollow that I found all this out. By sheer chance I ordered a "chambered" instead of "semi hollow" artist 3 because I used both terms interchangeably. If I ordered an hour later, I may have stated 'semi hollow", its just what my brain was thinking at that particular moment as to which term I used. Anyway, when I looked at the guitar and held it next to my production artist 3, I saw the thinner body and thought they sent me a solid body by mistake. My dealer called PRS, and they informed them on the spot of both varieties, and I had speced "chambered". They told us to hold it side by side with a solid bodied one, and we did. Sure enough, it was thicker than the solidbody, but thinner than the semi hollow I had really wanted. Remember I had waited 2.5 years for the guitar!!!! This is when i found out how cool PRS was. It was my mistake, and they STILL offered to make me another guitar if I was not 100% happy. they told me to play it side by side with my production artist 3, and see what i thought, which I sat down and did. That particular artist 3 was the best sounding of all the artist 3s I had owned (many), and it sounded every bit as good. On top of that, look at that top!!! No need to build me another one!!!