I'm absolutely certain it will be pretty nifty. However, once i have willingly decided not to do a login ( i don't use gmail or Chrome ) it should just not feel the need to shove that to my face everytime. A first time setup prompt is all that is needed and once you say no it should tell you " ok, you're missing out but in case you do feel like trying it out - it's in settings->log into account".

Since Apple Maps works perfectly fine for my area ( yes, i'm aware there's a world outside the Bay Area where Apple Maps is horrible), the constant nag for a login is enough to for me to stop using it. It is an awesome app though.