We finally made it to Posh this past Saturday night and what a disappointment to say the least.
There were three of us there, ordered 5 course tastings and there was not one totally successful dish out of the 15 in total. There were some good parts to some of the dishes but nothing even came close to a WOW.
Calling it improvisational is also a stretch. You fill out a form with a bunch of proteins listed, check what you don't want, circle what you really really want and then list anything else you prefer not to have in the dish, i.e. a spice or veggie you don't like. To me it was just more like mystery dining, nothing was made special for me as lots of other diners had the exact same dishes.
Service was okay, should have been better for the cost. I think our waiter tired of us by the end of the meal anyway, vibes of disappointment coming from the table.
The only thing that was awesome was the vodka the waiter suggested which I believe was called Russian Standard, very smooth indeed.