My experience with my 457 Varmint MTR and 455 stainless were basically the same as Beeron's. Decent groups but usually a flyer that would ruin it.
They're good for hunting accuracy. But they're not "match" ammo. I'd probably rank them above Winchester wildcat, federal blue box bulk, federal red box bulk, Aguila super extra lead and copper, and depending on which gun it's probably on par with CCI Standard Velocity.
This has been my experience with it as well. Definitely won't be going out of my way to mail order it in.