You might want to go on the Delta site and search for posts on Concorde - several posters there have reported on recent flights on the AF Concorde.

I flew the BA Corcorde in 1996 and would do it again in a heartbeat (if I had the money or the miles!). The only uncomfortable factor was the low overhead clearance when getting in/out of the seat, but otherwise, the seats were very comfortable, the meal and wine service outstanding, and the flight crew were both professional and friendly - imagine that - and the flight itself, especially takeoff, was awesome.

I tend to agree with the previous poster - my overall experiences with AF (even in FC) haven't been as good as with BA, however, let me reiterate that I haven't flown the AF Concorde.

If you're thinking about, don't wait, just do it while you can!