The minimum to claim this bonus is 20€ so I made a 20€ deposit with skrill. Since it was Wednesday, I had no problems with receiving the bonus, after deposit it was in my account right away. I had 30€ balance and needed to wager 350€. Since my balance wasn't very big, I went to play Robojack slot, a game I really like but never spend enough time with. I played only with minimum bets and I guess it wasn't my lucky time as I lost very quickly 13€ and then, when I got free spins round, most of the spins were empty and I won less than 20x bet. I was down to 10€ when I hit another free spins round. I was lucky enough to get 2 scatters that added 8 extra spins but even then the win was only 3.80.
With around 14€ left I went to play 300 shields slot with minimum bets. Quite soon I got free spins and I managed to get to 2nd stage and won 3.90€. I continued to play and I had less than 1€ in my balance,when I triggered free spins again, this time I made it to third stage and got almost 100x bet win which was amazing. Then I upped bets to 0.50€ and played for about 30 minutes, at some point I got another bonus round but it paid peanuts and eventually I got busted.
Overall I think this bonus is very good because of the wagering requirements. For the maximum you can deposit 80€, get 40€ bonus and have great bankroll of 120€ .This is great to have a little extra money in the middle of the week and game selection is decent too. They should add more games to make them even better.