Safety Tech C420 PAPR device

Been running FM53 with filter directly installed into gas mask itself, but planning on getting C420 soon.

AVON C420 seems to be a bit pricy($450ish), while I found Safety Tech C420 which seems to form its price somewhere around $150.

Though there's not much of reviews or infos about their C420, so curious if it's nah or good to buy.