I have a 705 which is tops for info – speed, distance, HR etc.
Mapping is awful as I am too mean to buy the maps (150e) so use the open resource ones. I have yet to find a fire track on it, its rather an expensive compass for mapping as thats all I get.
Also, battery life is pants – 7-8 hours or so. I keep forgetting to recharge so most days it dies on me.
Saying above I do like it, loads of data, something to look at, HR is good for training.
BTW altitude is way off on the 705 – I’ve checked when walking & other GPS s. Shame as I wanted accurate altitudes.