From what ive seen and read the game is all about the bonus. The base game wont hold up if the bonus takes an age to come in.... but if it does it shouldnt dissapoint you to the tune of bonanza! Hit bonus or bust type slot, from what ive read and seen - and in no way is this an expert opinion
I made a thread about this slot in the beginning of December last year because i tried the slot for the first time and i had done 1351 spins and the bonus didn't trigger once, So it can go a while without giving the bonus.
I have tried it again since and managed to get a couple of quick bonuses, The most i managed to get from the bonus was 150x.