Last year ,I made a couple of threads about them and people who used them actually complained (I'm not sure If you found them or not ) but all details were there and If I were you I wouldn't think of using them.
https://bitcointalk.org/index.php?topic=1130864.0 (July 2015)
https://bitcointalk.org/index.php?topic=1175507.0 (September 2015)

A rule that you should follow (I work with it and I'm fine till now) : anything advertised on Cointelegraph and nowhere else = scam.