Easy to follow, lots of routes etc? Ideally don’t want to spend £200 but if it’s robust and lasts 5yrs I’m all ears. 🙂

Garmin Etrex 20 or 30, Dakota. Lots of routes? – well as many as you want to put on the device.

Easy to follow? Depends on whether whoever created the route set up the turn by turn feature correctly. (It’s a feature of the route file not the device) You’ll get a trill or beep about 50m or 100m before the turn, it’s up to you to check which way to go