I had the PN50A450, and I had the glasses and emitter, and when I was playing Avatar in 3D I thought it was "pretty" cool. Not the greatest by any stretch, but decent. There definitely was much more ghosting than I got with my Panasonic VT20 (that I no longer own). The Panasonic was just way better in every category. Still, if I didn't sell my 450, I would probably be looking into figuring out a PC based solution for 3D Blu Ray, and maybe somehow getting Direct TV to work in 3D as well, by running it thru a HDMI detective, and a Avertv Capture Card. Not sure if it would actually work, but I'd look into it more seriously.
Of course, this would only make sense if you already had a top of the line gaming PC, and it was only a matter of adding a couple of components to your PC. If you have to build a PC from scratch to make it all work, then you'd just be better off selling your B450 on Craigslist, and buying a PN50C7000 when it's on sale.
Another thing you might want to consider is some higher-end shutterglasses if you're using the ones that come with the Samsung SSG1000 kit. I was reading on another forum about a guy who go the SSG1000 glasses, and then later he ended up getting some higher-end glasses, and he said the ghosting was quite a bit less with the better glasses.