I flew on Concorde in 1988, it was quite an experience, still have the little goody pack that they gave you. The sound barrier thing was a non event, as is Mach2.0 at 50 odd thousand feet (which as it was a passenger jet is as it should have been) but you can definitly see the curvature of the earth, and the thrust reversers on landing leave you in no doubt that they are reversing the thrust.........
On one of the early flights for the press the comment was made passing M1.0 to one of the design team "nothing happened!", the reply - " THAT was the hard bit"