Coming back to what the OP asked,
I've been to the Fat Duck
The food is, without a doubt, the best in the country (having personally dined at Ramsay, Waterside et al.) and possibly the world (If someone wants to fly me out to El Bulli, French Laundry and Pierre Gagnaire I'll confirm it
). Not only is execution flawless, but you can expect to enjoy truly unique meals. I would quite confidently describe Blumenthal as one of the best chefs of his generation. A la carte is about £90, the tasting menu is ~£120. I think there's a cheaper (~£60) set menu for lunch too.
That said, I'm of the opinion that the Waterside (round the corner for the Fat Duck) provides the better overall experience. whilst the food is undoubtedly better at FD, the opulent environment of the Waterside (along with top-notch food, of course) gives it the edge.
I've been to the Fat Duck
The food is, without a doubt, the best in the country (having personally dined at Ramsay, Waterside et al.) and possibly the world (If someone wants to fly me out to El Bulli, French Laundry and Pierre Gagnaire I'll confirm it

That said, I'm of the opinion that the Waterside (round the corner for the Fat Duck) provides the better overall experience. whilst the food is undoubtedly better at FD, the opulent environment of the Waterside (along with top-notch food, of course) gives it the edge.