Honest feedback here:
I found the Snooper to be a bit cheap in its finish. It only lasted 13 months before the power socket broke away from the motherboard too. It really struggled with some small but not weight restricted roads.
Tomtom are too expensive in my opinion and I’ve never found a way to switch them to imperial units when setting up vehicle profiles, so headmaths is needed. (I hate maths)
I have a Garmin which on the whole is a good unit but has a horrible habit of changing its mind mid-route and deciding that because its 20 minutes quicker, a 15ft trailer will find a way under a 14ft5in bridge.
I’ve never tried a CoPilot.
They all have their plus and minus points. The main thing to remember is that you still need to carry a backup atlas just in case, and keep your eye out for signs the satnav have missed.