I've walked most of it (though I couldn't find Saturn for some reason ... I suspect it was stolen).
And yea ... it's a ridiculously effective demonstration of how hard it is to comprehend big numbers. I knew these numbers, or had read them before hand, and thought about them ... but seeing it all to scale was kinda devastating ... like the distances between the outer planets are huuuge ... you get tired walking them even though the planets are 5cms wide.
And yea, the proxima centauri thing is a very nice touch!