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About mentioned sites. I never used them, but sometimes I need to exchange btc to pp, so it is interesting for me.
I've seen that changex fee for bitcoin to pp is 4% and minimum 15 USD. I think it is quite expensive, recently I funded my paypal via unichange.me and their commission was 2.9%, minimum 2 USD.
I searched about this 3 sites here on forum and the result is:
rchange.net has thread in Chinese - for me it is hard to understand what is in their threads
changex.com has thread in Russian
unichange.me - the only of three has an official thread
hereIf I am going to choose where to convert bitcoin to paypal, among these three I will choose unichange.me