So we've got one at Fleming Instruments & Repair here in Houston! Here's my very quick review.
Out of the Box: The guys in the shop are split 50/50 on lacquer color. I personally like the honey gold, most guys say they might be trying to hard to match the old Mark VI's. Most of us don't like the engraving, very busy, and doesn't look to be hand-done. The engraving extends all the way up the back of the horn, near the thumbrest and even higher. Case is phenomenal, very balanced, protective, and stylish. 'Concept' mouthpiece looks cool, I chose not to use it. The sax needed minor adjustments to pad height and level out of the box. Some light feather scratches on the bell flare out of the box as well. Nothing major at all, but something I did notice with ours. Key and clothes guards look very modern and light, but feel a bit thin. Overall a beautiful horn in a beautiful package.
In the Hands: Ergonomics are good. Nothing feels out of place under the fingers. I do like the newly designed front F key. The sax is heavy and feels like a professional instrument sitting in your hands. Action was smooth and quiet. Palm keys feel excellent with rounded edge. Side keys (new angle) took all of 1 minute to get used to and felt very intuitive.
In the Practice Room: I played it for about an hour. I'm classically trained so keep that in mind. Selmer C*, Vandoren reed sz 3. Good open sound, very free blowing and has the ability to sound even in all dynamic levels. Core sound is warm and open on my C*, but responds well to adjustments from the embochure. Low range is a bit punchy for me and I noticed I had to pull back a bit on air pressure below low D. Intonation issues are... better, but not perfect. I hit it with a tuner after a good warm-up, and the same issues we all have still exist on this horn. Flat notes are flat, sharp notes are still sharp, etc. It's better, I feel, but only slightly. Altissimo registers speak and 'slot' better than many horns I've played and tuning has improved slightly.
Overall, I like it. Would I trade in my Yamaha Custom or WO20? Maybe not, but I feel it's a good entry for the professional horn market. It's a bit flashy, and is pushing into 'over-built' territory, but I would definitely suggest it to professionals that come into the shop looking for the best.