Hi Bill,
I'm just going to add to Karl's response. I found the scrying mirror I use most of the time in my grandparent's barn. It has a homemade frame and looks like it was used possibly as a medicine cabinet or kitchen cupboard door. It's not pretty, it was painted with the same paint they painted the cabinets with and is dingy with age now but it's really solidly built and there was something about it I just liked. The first time I used it, instead of seeing images, I heard sounds. They were the sound of dishes clinking and supper conversation, just day to day type stuff, probably my grandparents from many years ago.
This is the difference between using a real mirror over a virtual one. It has a history, it has absorbed the energy of its surroundings and the people that used the mirror over time. You can connect with that energy and re-live the past or learn things about it. The energy that it accumulates becomes a doorway into the past and other places not from this reality as well.
The virtual mirror does not have this physical connection. i tried out the mirror that you gave the link to. It works. I'm pretty impressed with how it does work without the physical aspect but in this case you are not really connecting to anything in its history, except maybe the intent of the person who created the virtual scrying tool. So it works and it actually shows that you moved pretty well because I think it would be harder to move this way. If you want to continue to use it, I would suggest setting a strong intention of what you want to see or know before using it and it should help with results.
So you see, what mirror you use does make a difference. If the black mirror you have was bought new, it doesn't have much history to it yet. All the years of people looking into mirrors adds to the energy of it as an object so the high use ones as Karl pointed out are usually best because they have 'lived' through so much.
Below is a link to a mirror scrying article on this site that goes into more detail. I'm not sure if you've seen it yet or not?
http://www.shamanscave.com/practices/mirror-scrying
Lorrie