Hi Mauserand9mm,
I had one in 375H&H and it was a good functional rifle, and shot reasonably well. I have not seen or heard of one in 458. The only problems I have heard of was a base model, so if you get one make sure it is one of the higher grades. They don't have the pizazz of an english double, but they are a good strong action.
LesLeeSpeed