When you have never heard of service it is likely not very good or in some cases a outright scam. This is even more true for anything that is says it is free.
There is no reason to use a proxy it only does web traffic and there is a lot of other stuff going on in the background.
Just use one of the better known VPN providers. You can get lots of reviews on those. Don't believe the so called review sites most are paid advertising where the companies pay to get good ratings. I have seen many where some completely unknown site is rated above the larger well known vpn providers.