Without knowing what you expect out of it, it's tough to say whether you'll be pleased or not with your choice. With "max effort" heavy bullet loads, it'll wake you up, and maybe hurt a bit in the process! Fortunately, it's not hard to make loads toned down a bit for it that'll do a variety of tasks and won't hurt you at all. At some point, you'll likely start casting for it, as it seems that even cast or swaged .500 diameter bullets are priced at a premium.
It won't shoot across canyons, knock down the timber on the way to a critter, lay it open and whisk the hide off with the wind the bullet creates as it goes by. It WILL poke half inch diameter holes through anything you're likely to encounter in the lower 48 at reasonable range.
Honestly, it's a LOT of fun, but realistically, it won't do much that a good .45-70 won't do.
Mine started as a .45-70 "Buffalo Classic", and I sent it in and had .500 S&W and .204 Ruger barrels fitted, giving me a 3-barrel set on one frame and stock set. Since I got into the BC for an extremely "friendly" price, I've got about $350 tied up in the whole rig, including the glass that I pulled off other projects.
I have no experience with the Barska glass, but I believe personally that the .500 is better off with a quality set of irons. I tried several fixed power, older Weaver scopes from 2.5 to 6X, and when the bullet weight and powder charge goes up, the closer that objective got to my eyebrow, and the bridge of my nose already has several dandy crescent-shaped cuts .