Wow, thanks for those links. Very interesting reading. Lots of debate if there is actually a benefit, and then, even if you think so, are you even getting the real thing??
I've seen an amp advertised in a NOS and non-NOS version for [Edit: $70] more for the NOS version. Not sure I'd bother spending the extra cash for it.
...so ever since then, I always hang on to the buckle.