I have used the D.R Harris Marlborough.
LOVED the scent, really didn't like the soap for straight shaving though. I gave it to my brother who uses a DE. He loved it.
Five or six years ago DR Harris soaps were all the rage in the 3017 crowd. I was really looking forward to trying them. Then people started complaining that the lather was dry and not slick enough for straight shaving and I was glad that I had not jumped on the band wagon. Years later I was gifted a sample of Arlington. I had really low expectations because of the history, but upon trying it I found it to be a really great soap. I've since tried Marlborough and had the same experience.I'll skip that one then.....thanks for the warning.
camo
I would have no problem using either of those DR Harris soaps as forever soaps for straight shaving. IME the secret to straight shaving lather is to hydrate to just before the lather starts breaking down. Just sayin', YMMV