You can change the server location with the free version, I believe they are in 13 countries worldwide.
I've used their free offers before and find them to be generally reliable though at times the speed can be slow as others have stated.
As for the question about comparing Windscribe with OkayFreedom; I used the latter a while back and did not like it at all, it seemed very slow and I had connection issues quite often in the UK, I'd personally choose Windscribe.