I have had a couple of Concorde flights. Quite memorable.

First impression was at the entrance door the FA met you and held her hand on top of your head so as to avoid you going bump.

The walk down the aisle was claustaphobic with dark and narrow for quite a long distance before you entered the cabin. Little room to store your typical first class kit, but the FA took care of that anyway. The seats reclined nicely and your feet went under the seat in front in the recline mode. No need to sleep as the meal service spanned the whole flight with the after dinner drinks served in descent.. The food was the best I ever had in selection and presentation.

The more memorable experiences were the study of other passengers in the departure lounge. Lots of lap dog and leather on the younger set. The older set seemed to fit the mold having been prepared by an undertaker with a quite waxy look and whitening . Most in the lounge stood as they sipped their high end wines and found somebody to talk with, I have some of my video of this stored someplace.

I seemed to fit in quite nicely in all this in my work clothes and was generally shunned with at least one seatmate asking to be reseated away from me