Yeah I think I have read about those on here a few times..
I believe it can work pretty well but it depends a bit on the quality of the adapter.. Some work better than others..
I like the idea because then you can also record the feed if you desire but it does increase the amount of load on your system as opposed to the monitor solution which doesn't..
I am looking at options like this, because I want to have four feeds, which I can record or view live, either all four at once or zoom in on individual feeds as required.
So far I am struggling to find anything that suits all of my needs