The must have features work, and that's it. – Scalextric ARC Review

And that should be satisfying, but it isn't. Because the ARC race sets are sold with all the hoopla of the app enhancing the Racing experience but so far some non essential features don't work. I'm not talking about the features for air and pro. On arc one that is normal, perfectly okay for some features to be grayed out. I'll explain after I mention what works. Timing and lap counter works as does Grand Prix and tournament modes with qualifying race and heats. Adding driver names, helmet colors, and car pics also work with catalog cars or custom pics of cars if desired (make your pic small in kbyte size for success). Solo practice doesn't work, but you can just add two and race one with standard finish so the race ends when you cross the finish line. Adding your stock materials doesn't work. Car speed works correct if you pick a track set that's stock or with scalextric's extension sets. You can't add an x amount of track pieces to represent your customized set. Various glitches happen making it cumbersome to get the app to work requiring a certain order of starting the app and blue tooth or need to uninstall and reinstall. So the app isn't polished and arc one and air are already out. Considering the many more features for pro, you got to wonder if it'll be ready and would it be wise to buy Pro without solid confirmation that the app works well.
Review by MrSqueezeMe on Scalextric ARC.