Well.. I implemented the free trial (along with a reminder on my phone to cancel it on the 19th of August!).
So far the additional features are quite nice but ultimately proven pretty lacklustre tbh. The heatmap is of passing interest just to see how far I've ventured / in which directions / which routes I've used most, while it's interesting to be able to once more see my relative performance on each segment, along with my overall ranking on each (although they're always well down). I like the relative effort numbers and weather reports too..
Oh - unsurprisingly to the cynic in me, now I've "subscribed" I no longer have to chase the display of my otherwise invisible PRs / achievements
Ultimately I still feel much the same as I did in that I can't really justify putting £50 down for a year's subscription.. the added functionality is nice but really just frilly peripherals with not a lot of tangible real-world value. So unless they offer a reduced fee at some point I have no intention of paying to subscribe once the free trial runs out.