The events have been good and glad to see them. my luck, as ever, is rubbish. I did nearly 300 souls on the top end of tier one (nine common and one 3 star) and got zero hearts. I did get five from a ring fill but nothign from the two level 6 I did......lots of skill Shards though (14 I think), 5 GA, 14 legendary and then got another Alchemist soul so really for just a pure grind out and no actual costs this event and the others have been spot on and if we get more of the same that will be fine by me.
Got my four birds too with Cyborg completed last night - I think in total a spent one or two refilss on SoT over the last five days so happy enough with that and all the extra stuff I got from LOL and BNW.
So all is good and with more to come I am pleased with the way the devs are taking the game.