APB is the new 6 car Advanced Powerbase(Digital). If I was starting out in slots again and was looking for a decent set I'd go with the Scalextric Digital Platinum set. Its the only set that comes with the new APB, 6 controllers, lane changers, 6 cars (Digitally chipped) and quite a bit more. I know the price is quite high but if you buy an analogue set and then add to as you go and then upgrade to the new APB later on, buy the 2 power units required for the APB,get some lane changers, buy the 6 controllers, 6 cars and the 6 digital chips to go in them then this is quite a lot more than buying the set with everything included (except the pit lanes which you will have to add on later). You can always buy more lane changers and upgrade to SSDC (Scalextric Sport Digital Console) at a later date and maybe Pitpro if you want to have pit lane speeds etc. The Digital Platinum set has all you need to start out in the digital world of Scalextric and you can (and will) have plenty of fun using whats in the box without buying anything else, just addd to it in the future. Your boys will love this and when their mates come round (and yours) theres nothing like having the 6 cars on the track at once, great fun. I'm pretty sure that the 6 cars that come in the set are what scaley call the high resistant types, blacked out windows, no interior but great for digital racing as there will always be a little crash and bang here and there and these cars cope well with digital racing, you don't have as many parts that can break compared to the higher detailed cars. Another bonus with the new APB is that it can run both types of cars, Analogue and Digital, as the APB has the 2 modes in which it can be used, great piece of equipment and you will definately love it. By the way I'm probably a little biased towards Scalextric as I've never used SCX Digital, Ninco Digital but have had a go at Carrera Digital, the thing that put me off Carrera was the size of the track, takes up a bit more room than the others and Scalextric seems to be available everywhere. Hope this helps out and most of all enjoy.
Matt