Vintage are a fairly standard Far-East brand. Like most of those, they're not likely to be earth-shatteringly great, but they're usually fairly reliable workhorses if you steer clear of any painted in bright shiny colours (where the budget has gone on spraypaint and not on the instrument itself!).
I'm not aware they do a metal-body, so I guess it's a Dobro copy with a spider bridge? One bonus with wood-body resos and lower-cost instruments is that what a reso guitar really needs is a firm mounting for the cone, and lower-cost instruments are usually overbuilt for speed and reliability of assembly. Which ain't so good for your normal acoustic, but is good news for a reso.
(That's the problem with the Fender reso, BTW. They took a standard Fender acoustic, and these are pretty crappy in the first place, and simply stuck a reso cone inside it. No particular attention to how a reso needs to work, how the air moves between compartments of the guitar, etc., and the result is predictably bloody awful.)
As regards a tinny sound, one other thing to check is that the coverplate and metal tailpiece aren't rattling. Oh, and also check whether the strings between the bridge and tailpiece are hitting a sympathetic resonance - if that happens then you can get odd buzzy noises, but a bit of felt under the tailpiece or a shoelace wrapped betwen the strings at the tailpiece should stop that.