Since last time I had no problems with receiving the bonus, this time I went straight to deposit page and didn't bother contacting support. I made a deposit of 40€ with skrill and received 20€ bonus immediately. I checked the wagering requirements and they were correct- with 60€ balance I had to wager 800€.
Since they have both my favorite software providers, which are Microgaming and Netent, I started off with my dear Twin Spin. I was getting cold and empty spins only and even though I was playing with minimum stakes only, my balance was decreasing rapidly. I did get one 5 reel combination, but it paid only 30x bet win. When my balance was down to 20€, I decided to try some luck with Immortal Romance slot. Unfortunately that wasn't a good idea and with 0.30€ bets per spin, I managed to get empty spins and only few winnings overall, but no big wins or anything like that, so when my balance reached only less than 0.30€, I went to Starburst. Within a couple of spins I managed to get up to 2€ balance but lost them very shortly as well.
I do like Oshi casino and my lack of luck had nothing to do with them. I had no technical errors, bonus got added without any issues and the game selection was very, very pleasing and I had no reasons to speak with support. And I think that 50% bonus is a good offer for 3rd deposit and 40x wagering, given the fact that the bonus is cashable after meeting wager, is quite good. I would recommend Oshi and this bonus too.