I actually have a Rio and it is good. After loads o treatment I didn't go for a couple of years and the hair started to regrow. I bought the machine and zap every now and then. My neck was really hairy and my face too. I was very upset about it for many years.
If little Miss Mini has dark hair she should get a good result. The machine Does only a small area, twenty hairs, and would be good for an upper lip. Legs would take a bit longer.
I would give you a link to mine but I am under the duvet using my Kindle and posting links is difficult. :-)