I'm not sure if LeatherPlus is a new offering or term for them, but I have seven Berklines in a navy blue color that have leather in every area you touch (seat and back, arms) and good fake leather/vinyl in areas you do not (back, sides).
The color matching between the two fabrics is excellent - I can't see the difference visually unless I get right on top of it and look for leather grain. The vinyl areas are definitely durable.
IMO, a good option - saved me several hundred $ overall, with no reduction in my appreciation for the seats.
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