There are 100 buck magnifiers you can get. I can’t see paying 500 bucks for a magnifier that just magnifies, with no reticle etc to worry about.
I wouldn’t be down on cheaperthandirt or any of the stuff they carry. I’ve had nothing but good luck with their goodies. The Barska scopes are pretty good believe it or not. I have the 6-24x40 on an H&R Bullbarrel .223 and shooting off sandbags it will blow the neck off a (empty) Budlite at 300yds consistently. Big time family entertainment for minimal investment.