This was a tough restaurant to rate, since I love the concept and think the chef is exceptionally talented. I didn't have a very well executed meal though.
Concept: 5 stars.
I loved being completely surprised with each course. When presented with the list of proteins, I only crossed off frog legs, and only because I had just recently eaten them. I specified medium rare for my cooked meat, and said raw was acceptable.
Bar: 4 stars.
Very good combination of alcoholic and non-alcoholic beverages
Execution: 3 stars because some courses were 5-star outstanding while others were 2-star.
The crudo dish was impeccably balanced between the fish, salt and acidity. It was one of the best courses I've had all year, anywhere. The rabbit, at the other extreme, was cooked beyond recognition...a huge disappointment given my request for medium rare.
Value: 3 stars
Value is the relation of price to quality. I judge value relative to other restaurants in the area. In this case, my benchmark for "high end" cuisine is Binkley's. At the prices Posh charges, I think it's appropriate to expect near-flawless execution. I didn't get execution that lived up to the prices.
I am hoping my experience was an anomaly and will return for a second chance. In the meantime, I can't fully endorse Posh to my friends and family.