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1. Really is a 3-pack. Great value. I wasn't sure. Yes, the picture stated it, but nothing in the text did. 2. Works as advertised as far as monitor emulation.
Does not have the thumb screws. Again, the picture states that, but the text does not.
I can't imagine why I'd want a 3-pack of "quick-release" VGA dummy plugs, but I'm sure there are folks that do. If do, this is your solution! For me, I have no use for plugs that have potential to fall out if the device is accidentally disturbed.
I was only able to get a max resolution of 1080p on a Mac Pro with a Radeon HD 5770 card. I've tried it directly connected to the DVI port as well as connecting through a MDP to DVI adapters. I was able to get higher resolution with a NVidia GT120 in the same machine, but there was a screen re-draw issue using a remote session. It might work well with PCs, but I'd stay away if you're using a Mac.