Got this private email from another collector, hope it helps:
I have never used Sei, but a long ago poster friend named Terry M of Berkeley, California (one of the truly great early serious poster collectors) swore by him, and I believe wouldn't use anyone else. Terry has seriously important rare valuable posters, so I assume Sei must know what he's doing, and is presumably trustworthy.
Although we seldom have linen done on anything anymore, in the past, we often used Sei for large paper not needing a lot of restoration. He was always quite reasonable. Never had any problems. I have no knowledge about items needing a lot of work.
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I have never used Sei, but a long ago poster friend named Terry M of Berkeley, California (one of the truly great early serious poster collectors) swore by him, and I believe wouldn't use anyone else. Terry has seriously important rare valuable posters, so I assume Sei must know what he's doing, and is presumably trustworthy.
Although we seldom have linen done on anything anymore, in the past, we often used Sei for large paper not needing a lot of restoration. He was always quite reasonable. Never had any problems. I have no knowledge about items needing a lot of work.