Cool! There is a similar app called Mosaico Window Manager http://www.soulidstudio.com/ which can save layouts of wndows, I am not sure between resolution changes though.
I just purchased a ICY BOX IB-SPL1031.
I am in the US and had to buy it through Amazon UK.
It wasn't cheap but I've heard it's one of the best solution for vga to display port.
I haven't gotten it yet but I will on the 14th