I tried my Cobra Daytona with the SureChange guide on ARC Pro and you're absolutely right, it didn't register laps. I put the car through the powerbase backwards and it did register, so ARC Pro does seem to require guide then ID. I don't have an APB with the original firmware to see if there is the same issue. I suspect it might be.
That's a shame, as the SureChange guide is a nicely thought-out innovation for digital racers. However, it remains 100% compatible with the C7042 APB with updated firmware, which most Scalextric digital enthusiasts will be sticking with for the forseeable future. Good to see Slot Car Union is now selling the guide.
I guess there are two possible scenarios where the guide might still come into play on ARC Pro. The first is if an optional digital-only firmware upgrade becomes available - as it did with the APB, thanks to co-operation between third-party RMS developers and Scalextric. Alternatively, the same ingenuity that produced the SureChange guide in the first place could create an ARC-friendly version.
For those getting into digital via ARC Pro, I'm not sure the incompatibility of the SureChange guide will be a deal-breaker. Having said that, I think it shows the need to find an alternative fix to convert those front-engined cars and the Legends F1s. That probably falls to the 3D printers to create digital-compatible chassis and cockpits to use with the standard Scalextric components (rather than needing additional Slot.it components).
Incidentally, the reason my Cobra hadn't been used with ARC Pro is that I'm converting it with an Olifer 3D chassis with a standard LED fitting. I really like all the aftermarket options that exist at the moment. It goes to show that the big manufacturers (essentially Scalextric and Carrera now) give us a product and some very clever enthusiasts come up with brilliant tweaks that occasionally take the hobby down new paths. It's great that some of those ideas get taken up by Scalextric and other manufacturers, but ultimately they have to make compromises to bring a good-value and profitable product to market.