I've played 'em all, and THIS is by far the loosest slot game out there. Really nice jackpots, on a fairly regular basis. Unlike most other apps that pay out well at the beginning, and get stingy with time, this app maintains its higher than average payout rate, giving the player a real chance to build winnings. There are the usual array of various themed games, but they tend to all play very similarly, so that is a bit of a disappointment.
There are plenty of ads interrupting game play, which is a universal complaint with ALL of these apps, but here they do sometimes give you an option to watch the ad or not, with a fairly generous reward of multiplied points, etc. if you do.
I'll stick with this one for a while to see if they keep it up, but so far this one is a winner!