Rusty’s 4” “Jeepspeed” rear leaf springs

Been looking at rear leafs ,stumbled across Rusty’s web page and they offer a 4” “Jeepspeed” 10 leaf military wrapped rear leaf spring for $500 made in Canada. Anybody know of this company in Canada and if they make a decent spring? I have done business with Deaver,National and Alcan over the years and have been happy,just curious if anyone has experience with the Rusty springs