Gorilla chief is one of the latest in a range of slots made by WMS, called G+ and G+ deluxe. It's a superb 5 reel video slot with a free spin bonus that can see you get 80 free spins at a multiplier of 2x for all wins.
As you can imagine there are some pretty big potential wins up for grabs if you get the free spins and it re-triggers, but also you can go through some quite long periods without a win too.
If you visit Las Vegas, you will see a huge number of WMS G+ and G+ Deluxe games, including Gorilla Chief. One of the nice things about these games, is they come in a number of different formats. Some of them have jackpots (progressives) and some do not.
If you want more regular payouts, then play the ones without the jackpots, but if you prefer to go for the one with the big win possible, then look for a jackpot version. One thing about the jackpots is that they do pay out regularly.
Some of the Gorilla Chief games with jackpots are very unusual. This is because they are set to pay out before the level hits either $50 (mini) or $150 (maxi). So, if you see one where the jackpot sign is flashing and it is close to the payout threshold, it is well worth playing, as you will stand a better chance of hitting it.