Now I have encountered other Book of "Whatever" slots from Novomatic and Play 'N Go. The all seems to play the same and the features are the exact same thing, however certain providers base game in their "book of" slots pays much than others, which is what you are looking for and book of ming is one of them. If you compare Book of Dead with this slot you realise book of dead is all about the free spins feature as 95% of the time the base game have empty spins, whereas book of ming pays well during the base game and teases appear to be much often as well.
You need to get 3 books on the reels to activate free spins. You are awarded with 10 spins and a special expanding scatter symbol (you know the drill). You can retrigger the feature and get more free spins, not sure if there are limits, but on average people get 4/5 retriggers. The symbol you would want is the oldish Chinese man as that one can pay you x5000 your total stake for full screen.
I like this slot however I do not play it often. LV bet has made some changes and now bonuses are not possible with e-wallet deposits. My most won during base game was x75 for line of dragons and I won x237 during free spins with 3 retriggers. I like this slot, just hope it would be available at more casino other than LVbet.