I am considering buying a macbook 12 inch. Some people say it

Are you referring to the 2017 MacBook? If so, I have one and it has basically been flawless for my intended goals for using it. However, I will share two things that you should be aware of before getting one:

1. The notebook uses the "butterfly" keys which were introduced at that time, along with them on the MacBook Pro & Air models. Since then, Apple has redesigned these keys based on user input and the newest Pro & Air models no longer are equipped with these keys. I find them acceptable, but it did take some getting used to. Your experience may be different.
2. This notebook only has a single USB-C port. This port is NOT Thunderbolt 3 capable. However, a number of third-party sources provided multi-port extensions should you need additional ports. For example, should you need to connect this notebook to an Ethernet network, you will need to get a USB-C-to-Ethernet adapter. This port is also used for charging so any multi-port adapter should also include a charging port.

As far as software, I am currently running the very latest version of macOS Catalina. Apple provides support up to five years after they stop producing a product. The last 2017 MacBook were produced in July 2019. Doing the math tells you it will still be supported by July 2024.

Other than those two things, I really like my MacBook. You cannot find another Mac notebook that is a portable as this one and my only wish is for Apple to reconsider bringing out new models in the future.

Depends what you want to do with it, even if it were reliable it would never work for me.

You're a little too late. Since they went out of production last year, they will only be available as used..

You're very welcome!