First time with a trackball so I will judge based on what I learned.
In contrast to the classics, ergonomic, and vertical ones I am used to, especially the vertical ones that I love.
Trackball has nothing to do with what I knew...
Very convenient DPI switch, first time I say this on a mouse... usually I say it's just useless to have it...

I like the position of the browser buttons.

Scroll wheel is ok, hard to press though.

Right and left click are ok.

Dance for a large hand.

My favorite is the USB mode but it has a weak signal when there are obstacles, the BT is good, I don't use it much but it doesn't lose signal easily, safe with a detection button so no one else can connect and mess around.

I simply love the height levels, especially the large one.

Trackball... correct size (I guess) if it was bigger I wouldn't mind at all but ok for a side trackball I think it's good.
Nice color.
Easy to clean.
The three movement balls inside give me the feeling that one of them creaks somewhat like kicking something strange... it doesn't always do it, it does it very intensively after cleaning it a bit to settle.
Unfortunately, I clean regularly because of my cat, so I gather hairs... it doesn't bother me but ok I mention it.
Basically, a very good first impression.

For games, think about it very well, it takes guts, it's difficult to do everything with one finger in MMO-RPG, MOBA it's okay but FPS and simulation...