For $125 (on sale), this gimbal is EXCELLENT. During my first few hours messing around with the gimbal, it's proven itself to be capable of matching up to the more expensive GoPro/Smartphone gimbals. I've taken a few videos already using my iPhone and GoPro 4 and it has kept each video as stable as possible even while I was running and jumping around. I've even tried it in different angles including holding it such that the handle was above the smartphone for a low ground shot.
Like other reviews you will see online, the very first thing that you NEED to do upon putting your smartphone onto the gimbal is to balance. Balancing the smartphone is a must because leaving it unbalanced will put way too much strain on the motors and the last thing you need is to break the gimbal because you refused to balance it. Another thing that needs to be done is to update the Gimbal's firmware. There isn't much instruction on that part but a short youtube search "Smooth Q firmware update" will lead you to a short tutorial.
The Smooth-Q has 3 modes: Pan Following Mode, Locking Mode, and Following Mode. When you turn the gimbal on it'll automatically enter Pan Following Mode. To switch to Locking Mode, press the mode button ONCE. To switch to Following Mode, press mode TWICE. To go back to the PREVIOUS (the last mode you were in before switching), press the mode button ONCE. This whole mode switching thing was the most complicated thing about this gimbal. The Zhiyun App does tell you what mode the gimbal is in while you're switching but when you're using it with a GoPro it just gets a little confusing.
Zhiyun has two different apps - Zhiyun Assistant and Zhiyun Play. They both do the same thing but I believe Play is the more recent app and Play's tracking feature works better. Be warned, the apps do need work but everything you need is in there like adjusting the speed of the gimbal's movements.
For anyone wondering how you can use a GoPro with this, you can buy an adapter that will let you mount the GoPro like a smartphone. I didn't get one of those but instead I kept the gimbal's smartphone mount on horizontal, took the GoPro out of its housing placed it onto the mount facing me. There was a gap from the top of the GoPro to the upper bracket and in that gap I wedged a pentel eraser which made the GoPro fit perfectly. Of course I had to move the GoPro slightly to the left such that half the GoPro was not on the mount, it's also a way of balancing it without having to move the gimbal bracket around too much. Now, the problem is that the GoPro will be facing you so the simple solution is to press the "mode" button 3-times to put the gimbal in selfie mode.
To conclude this long sort-of review, if you're looking for a cheap, quality gimbal that will get you that stable shot then Smooth-Q is definitely the way to go. However, be warned that it does take some getting used to especially the Pan Follow mode. You will certainly have to adjust the speed settings (how fast it pans, rolls, and tilts) of the gimbal in the Zhiyun app to where you like it. But after setting it all up and getting everything together, it works how it's supposed to and it'll get you the smooth shots that you've been looking for.