I find weird saying this, but I am using the machine my uncle (who's a architect) gave to me and my brother over a decade ago as my main machine. It's a black and silver Dell Vostro 3550, and just to show how old it is, it has a CD drive slot.
Of course, this machine has shown its age over the years. The touchpad barely ever works now. The Intel sticker has lose its text. The Windows 7 sticker is nonexistent. It requires all-time battery charge whenever it is on. And it uses the Intel i3-2310M, which is very old.
With a CPU this old, I have got some problems running newer software. One time I am very excited to try Bun, the blazingly fast JS run-time, until I realized that Bun requires AVX2 to run properly, which my CPU doesn't support.
However, since switching to Linux, I have been pretty happy with this machine. It's the thing that made me got into Linux and programming. And it's the thing that I used to write this post.