Welcome to the forum Wardie.
I am rapidly becoming either a technophobe since retirement or just another old dog who no longer wants to learn new tricks .
As ardent admirer and user of VR, I was initially dissapointed in the OA appearance. However I can continue using VR as I do now and for the foreseeable future. So no problems there. I still have access to everything I purchased and my annual subscription to VR, much the same price as OS, has given me the added "benefits" of O A. I will miss buying routes from VR of course but I never bought that many and I can still download purchased routes as external GPX files anyway, so no loss there, providing I can find them.I have been having a good look at OA and find that their TOPO maps are way superior to the IGN maps I bought for Spain and France. Much easier on the colourblind eye and just clearer, for reasons a previous person explained in this thread.
I have used it to plot a mythical route for fun, just to learn how to do so, and if I can, then most can. I have not yet used it to track an actual walk whilst out there or to follow a route.
In short it doesn't seem bad and as I explore, slowly, it may have some gems that VR misses. My hope is that OA just start using the VR plotting and route guidance. Then I won't have to learn anything much.
The absolute fact is that I will use VR when out and about because I I trust it. Also OA have taken on the VR team, and that team have an outstanding reputation for first class customer service, ask them anything and they respond in double fast time.
As with everything its horses for courses. I like my Nissan my sister loves her Citroën, but they both do the same job of getting us from A to B which, I believe VR, OA, OS, Garmin and others do. You goes for what you likes.