on your side question :

I use 2 pages and don't have a power meter. (I have a 500, so no maps)

My first page is my usual ride page : Speed, time, avg speed, stuff like that.
My second page is the climbing page : Speed, grade, altitude, gain speed, temp...

I don't plan on having more than 2 pages for now, maybe I'll add one when I'll get a powermeter.

I don't use my HRM strap because I hate that thing, but when I'll get my Smart helmet, I'll put in on my first AND second page)