I have not used a super tweeter for about 50 Years.
In my apartment as a student I had a JW full range driver in a TL. These units start to roll off at 10 KHz. Unusually for a full ranger, there is no break up peak.
STC 9 Standard Telephones and cables made a ribbon auditorium mic for the BBC. The BBC asked STC to build a super tweeter for one of their monitors. This was back in the tube days, when everything was 16 ohm. These tweeters were made available to the public. So I used a couple of these to supplement the JWs above 10 KHz. Those TLs were really good speakers by the way.
STC broke up and the audio division was sold to Coles. So these became know as the Coles super tweeter.
Here is a Spendor BC1 monitor with that tweeter. It is the top unit. It was a very good tweeter.
This Aperion product is Bogus BS.