I have been buying through metamask since the begining. When claiming for me it says it will charge you x amount in gas price to claim although when i do claim only a very small percentage comes off my remaining eth balance im not sure excatly how it works but i am happy with it..i also buy from bitfinex and tranfer to mwtamask, then on the eos.io site thwy auromatically come up registered from the first time i registered my keys i presume?