For your first deposit in Mr.Green casino you can get 100% welcome bonus. But wagering requirements is very player friendly, only 35 x bonus. Moreover, if you did not touch bonus and want to make withdrawal - you can cancel it and request your deposit + winnings. I think it is most generous system, which did not force you to make wagering requirements if you not touched money which casino give you as a bonus. Huge thumbs up for that.
I claimed this bonus with 25 euros deposit. My bonus was credited instantly, and to check how much wagering requirements you have you need to open special page in my account section. Nothing hard, also there you can cancel your bonus.
I started playing Wild Turkey slot game. Things go very well for me from beginning, couple of 4 of a kinds of high paying symbols bring me good results from start, and then I decided to leave this game, my balance was at 80 euros mark, not huge improvements, but I played 0.4 bets, and it is not so bad how probably you think. Then I tried couple of Nextgen games, did not have much fun, but to be honest I played it with not big bets for about hour or so, and had a lot of playtime. And I just lost only about half of my balance, so I can't say that everything is so bad.
With 40 euros I go to Dead or Alive. I played 0.45 bets, but when my balance reached 20 euros (I touched bonus money), and I decided to not make my bet lower, because I touched bonus money and was required to make wagering requirements. My 20 euros survive only for about 100 spins, and I lost balance.
I rate this bonus with 10 stars. Everything is awesome with it.