That is insanely good!

It's rare to have something so usable, on mobile, in browser.

Top class work.

I've been toying with a personal mapping app. Nothing like you're doing, but the chunking and level of detail data streaming etc is melting my brain.

Again. Fantastic work. People are going to love this.

Very cool site, great work!

The detail is amazing, there are other sites that show the Topo50 maps, but you can't zoom in half as far as you can with your site.