Over time, a PC case becomes a real dust trap. The fans draw in fresh air (along with the dust), and it settles on all the components, fan blades, cables, etc. There's one solution to avoid: using a vacuum cleaner. You risk sucking up components...
Alternatively, you can blow it out. There are cans of compressed air for this purpose. But it gets expensive.
When I saw that Amazon was offering this electric dust collector, I didn't hesitate.

And I have no regrets:

The pros:

✔️ Very powerful.

✔️ The power is adjustable. And thankfully so, because too much power can damage components. With another device of this type, I unknowingly disconnected one of my hard drives!

✔️ Comes with a multitude of accessories.

✔️ Battery operated. ✔️ Good battery life.

Cons:
❌ I can't think of any.

It comes with all the necessary accessories: nozzles, brushes, etc.

I recommend using the lowest power setting and gradually increasing it as needed. When using it on a PC, be careful around the most delicate components. I read somewhere that it's best to block the fans with your finger, as the airflow will make them spin. Not necessarily in the right direction, and certainly not at their usual speed. I imagine that wouldn't be good for them.
I also used it to dust places inaccessible to a vacuum cleaner.
For the keyboard, blowing isn't enough. The narrow nozzle allows you to get into a few places, but most of the dust is just moved INTO the keyboard. For a proper cleaning, disassembly is necessary. (Take a picture beforehand, so you can put the keys back in place!)
Tip: Wear a mask, because the air coming out of the PC is very dusty! :)
In short, a good product, which I recommend.