Not sure what you mean by youtube reviews, but here is a professional review of the Sierra-2:
https://positive-feedback.com/review...2-loudspeaker/
which then led to us winning the positive feedback writer's choice award
https://positive-feedback.com/audio-...choice-awards/
I don't believe in "youtube" reviews by non-professionals - as such, when these self-proclaimed reviewers ask for us to supply them with speakers, we say no.
In addition, we don't advertise - anywhere - and as such, most review sites have no interest in reviewing as most of these sites are driven by ad revenue...