Have to say, overall the basegame feels abit boring, but atleast if feels that the extrabet actually helps you to get bonuses way more often than without the extra bet.
Bonus itself is pretty interesting, atleast its something new, every spin feels like it could pay massive, even without bigass win multiplier.
I got couple bonuses. Most of them I lost in the first gamble, and one time I took the 7 spins, and this 324,5x (calculated without the extrabet) that ended uo being the best win from that game.