I don't know anyone who has engaged nannies from Super Nanny Services personally but I have chanced upon their Facebook page and it rates 4.4/5 on average. The reviews from parents are mostly positive and they seem pleased with the services provided. https://www.facebook.com/supernannyservices/
My friends who hired them said they were really good and experienced. She recommend me as well.
Even I havn't personally experienced with them but Super Nanny Services does look promising.
Yes super nanny is really reliable. Thumbs up
Jasmine Cai