I use KeepSolid unlimited and it meets my expectations. in past i've tryed many vpns like seed4me, OkFreedom, even Windscribe free, but the Windscribe app was quite inaccesible, just like it's website. once I forgot my password, tryed resetting it many times, it kept on telling me oops, someone jumped over the cable and broke it, please wait while we repair our lovely cable, but they could never repair their lovely cable, I don't know if it works fine now
because of their endless cable trouble i've unsubscribed from their funny ad mailing lists and they said well, if you choose to go, then we'll cancel your monthly 60gb trafic, I said do whatever you want. i'm happy that I got rid of them.
for now I have 1 year subscription of KeepSolid, it's actually enough for me. Pluss it has 3 datacenters in Istanbul, this is the most tasty part, I connect to them when I need to use vpn.
it even lets me creat manual configurations for any protocol so I don't have to install it's app. i'd rather use manual configurations than dealing with vpn apps.