I actually had a modern one by Dreux and still have an original Borel. The originals use brass reeds which are more sensitive than the stainless steel modern ones. The Borel was also smaller in cross section and about 12 ounces lighter, which makes for significant ergonomic advantages. In terms of quality of construction, I would say they were equivalent.
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A new one is under $1500 and infinitley better made.