Quick take
The G3 is one of the cheapest cars in the game. It looks cool, has surprisingly good customization for its price, and for some reason, I really like its turning animations. They make the car feel visually satisfying to drive, especially when you are just riding around the city. Even if it is not the most comfortable car to control, it has a nice style and a fun visual feel.
Driving experience and upgrades
Despite the fact that the animations are incredible, the G3 definitely feels less comfortable to drive than the cheaper C2000. Even with upgrades, it can be hard to turn and drift, and upgrading the car does not fully solve this problem.
You can safely upgrade most parts to the max level. The G3 also has a universal tire tread available, which is the last option in the tire list, so I recommend using it for general driving.
Be careful with suspension upgrades. For me, AF-DS25 feels much better than the final suspension upgrade, AF-HDS33. With AF-HDS33, the car becomes uncomfortable to drive and almost stops turning properly. Feel free to test it yourself, especially because G3 upgrades are not as expensive as upgrades for many other cars.
Customization
For such a low-price car, the G3 has very good customization. You can buy front parts, a rear lip, spoiler, accessories, wheels, and livery options. Many of these parts also have several variants to choose from, which makes the G3 much better if you care about changing the visual style of your car.
Final thoughts
The G3 is not a strong enough upgrade over the C2000 when it comes to driving comfort. It is less comfortable to control, and its speed is not much better. However, the car itself looks good, has nice customization, and feels visually satisfying to drive thanks to its great animations.
Overall, the G3 is a good car to buy if you want something cheap that you can customize to your taste. Just make sure to try it in the test drive first, so you can see if the way it handles fits your driving style.