to be honese I haven't got involved much with tipsters in this forum , the majority of tipsters here aren't posting how much they are up or down with their picks which is always a shady thing to do since it mainly means they are hiding something
but personally I'm involved with some tipsters outside bitcointalk and I'm paying them some money monthly for their service , you can check my progress in my following thread since I'm tracking every single pick that I follow for them
https://bitcointalksearch.org/topic/m.17941510
so yes i vouch better to look for a member who have reputation already outside the forum and offering the service here.