But that's exactly where only those with the competence to set tracking should be using it. If it uses the same basic principles as basic tracking at a garage then there shouldn't be an issue. The difference with some of the 'basic' garage equipment is that they are easier and quicker to set up for commercial purposes - time is money n all that.
i only ever pay £20-£25 for basic tracking and never had any issues until now where I have some wear on the inside edges of my tyres. I've not had it done for a long time to be fair. If the above system is reliable and actually gets good results I'd be happy to try it. I look after more cars than I care to count but even on my personal cars/family cars it would pay for itself very quickly.
i have my own tyre machine and balancer but I can still get the same results, possibly better results at home lol.