There are a lot of great VPN services, but if you think that you are truly "hidden" from anyone seeing what you are doing you are wrong. The VPN companies are required to save a log for users and IP that the users get for a certain length of time. This is if you are using for illegal reasons.
If you are just using to be "hidden" like at a cafe or an airport, then most VPNs do a great job. I used Elite VPN for the longest time and they have been great, plus cheap! I think it was $29.95 for 5 devices, including mobile devices, a year.