Why change a perfect, basic, colourful and easy to use program.
I can imagine this to be a very good start for those without Sat Nav., maybe that's who Nav'N'Go are aiming at. My wife struggled a bit with iGO8 but soon found her way around Amigo.
I have everthing working on my Mio P350, with the odd 'tweak' from these pages.
Having said that, I'll probably stick with iGO8 at present as I miss the multi vias and optimisation.
When searching for a POI 'On Route', iGO8 would show all POI's on route first, with a green indicator, then yellow for slightly off route and red for some distance off route, when selected they would become POI's. Amigo puts them in order of distance so you have to scroll down to find the 'greens'. Once selected it becomes the destination and you lose the ETA/distance to your final destination.
Block Road used to be handy, although not essential, for when travelling up north and wanting to block the M6 Toll, I know I could set iGO8 to avoid Tolls but that would mess up my routing by avoiding the Dartford Toll as well.