Those cheap ones are terrible.
I bought one like that one from titan-ice for my pc after I got my R9 290 and it was so blurry unless you turn the sharpness on the monitor right up. Got the first one from Matrix computers (about R150) , and took it back. It was so bad that their screens wouldn't pick up the signal. I then paid R300 for one from Incredible connection which looks exactly the same, and it's not quite as bad, but it's nowhere near good.
You'll probably have to get an expensive powered adapter to get a proper signal. I'm going to attempt a conversion on my monitor side.