Got exactly what I paid for.
I brought a selection of driving test routes for my nearest testing centre from this website. I couldn't find any reviews on the website which orginially concerned me but decided to go ahead with the purchase anyway.
Immediately after I paid for the routes, they were emailed to me. The GPX files were very accurate and mapped out the route perfectly. It worked with Google Maps like I ordered so you could see the route, but not in a way which enable me to follow it in live time with my location like google navigation when going to a destination. However, all I needed to do was get an app called GPX Viewer and I could open the route with my current location being overlayed so I could follow perfectly in real time.
Summary: got what I paid for straight away. Bit fiddly to set up if you want to follow it in real time, but not too complicated.