Dam I gave a nice detailed reply then noticed I had a PM and went to it without clicking "Submit Reply"........LOL. OK
I Have both Carrera and SCX cars. Neither are as fast as the Ninco and their brakes don't stop them as well. I think the Carrera magnets(for sissies handling LOL) are too close to the track and may hurt the motor after running them for long periods. Track is track. In my opinion (and that of many more, including a lot of owners of current digital sets) the other companies were in a big hurry to corner the digital market and came out with theirs too soon. They can't run their old Analog cars on the Digital systems. They can't run other brands. They don't sell parts to convert other cars to digital. Ninco waited until they developed their system so it could do all of that. Run all brands, Analog and Digital. Their Decoder chip will work in any car that has room for it to fit in. It's a simple install and they can run on analog track with the chip installed (the other brand digital cars won't run on analog track like mine is now). For Ninco cars you just unplug the motor from the pickup shoe and plug the chip in there then plug the motor into the chip. They you program the controller and car like the Spektrum DSM Radios. I just got lucky and bought the Ninco from the start.