Probably the Borgeson. I’ve never heard of PSC-(Parts Source of China) Lol. They need more than that on their website and lots of real solid reviews for $900.00."100% New". No apparent adjustment at the input end.
Reminds me of the "100% New" box sold by...someone else...with no adjustment, and sourced from China. Somebody else was posting about that on this forum, maybe even in this thread...but I'm too lazy to look it up.