DavidLouis 4ohm 104BE25-4 Pure beryllium dome tweeter Nd magnet & davidlouis BE28 pure beryllium Be dome tweeter speaker Nd magnet. ANY GOOD?

Hello all,
Does anyone have any experience with either the DavidLouis 4ohm 104BE25-4 Pure beryllium dome tweeter Nd magnet or the davidlouis BE28 pure beryllium Be dome tweeter speaker Nd magnet? I can't really find anything online. (good or bad...) Please advise... Thanks in advance.
 

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You're on your own with this one. Please report back if you decide to purchase it.
I did once buy a pair of his copper-coloured dome tweeters, but I sold it on before I could get to use it. Build quality looked as good as any from the main brands, but that is as much as I can say about it.