I personally prefer the barebones features of the Ambit3 Peak to all the bells and whistles on the newer Suunto (or the Garmin etc) watches. In fact I’m tempted to buy another Ambit3 Peak for when/if my current one breaks but it’s built like a tank.
Just install the Suntolink software on your PC/Mac. The old Movescount web interface uses Suuntolink to connect to your watch when the watch is plugged into a USB port on your computer. It’s an easy download and install. The Ambit3 Peak is incredibly configurable if you want to go down that route. Suunto has decided (for now at least) to not invest in adding all that configuration capability to the Suunto app; they instead rely on the Movescount web interface to support that functionality.
You could use the Ambit3 Peak straight out of the box with the “factory” configuration and never mess with it. It would work just fine.
Check out Andrew Skurka’s excellent blog posts on the Ambit3 Peak and his customizations for ultrarunning, backpacking etc