Use it only on the laptop, with a stick
Are you satisfied with your current internet speed? If so, then it is not worth it. Otherwise yes.
No…
Depends on. I think 30 is enough for a person alone, but more is better in most cases
If you are dependent on internet from the air it is bad anyway and you take what you get. That would be enough for me in an emergency. But stationary not less than 200 Mbit.
The question is whether you would be really satisfied with 20 Mbit. Perhaps you are still not satisfied enough even if things are going better. That depends on your main uses.
Don't even want to know what you're paying in total.
Now 23.- then 29.- monthly without limit…
After all, and yet. Well it's a different technique. But the price is outrageous in comparison. I pay 19 euro or less for 500mbit + telephone, TV and bells and whistles.
But if there's nothing else you have to bite the apple.