They came out around 2011, if I recall correctly, so they are not new.
Because of the price and small eye relief, few people have bought or used them.
Here is one comment:
https://www.cloudynights.com/topic/5...-uw/?p=6997398
a comparison with other eyepieces in the 10mm range:
https://www.dropbox.com/s/tkk44ufa7z...ested.pdf?dl=0
another comment:
https://www.cloudynights.com/topic/6...uws/?p=9372381
and another
https://www.cloudynights.com/topic/6...uws/?p=9374545
and a lengthy review from 2011:
https://astromart.com/reviews-and-ar...daniel-mounsey