I let it lapse for a couple of years and the one thing I missed was the connection with previous rides you may have done – like seeing you’ve done a segment three times before and looking at those past rides is a cool feature. Not just how fast you may have ridden something, but the memory of those previous rides.
The route-finding via heat map is very good if you’re in an unfamiliar area.
For me it’s worth paying for when considered in isolation, just that there’s a lot of good, useful apps that cost 50-100 quid a year so you have to be selective at some point.