I played my first (a 5x) and won it (of course).
I wanted to hate it, but it was fun and well designed. The only objection might be to how quickly the blinds move up. A tiny increase across the board in that area might make everyone happy enough to stop complaining.
May I suggest more ebullient music or reactions when you win. If you want to make it have a slot machine feel, you need to have the slot machine-type sounds.