How is that experience?

it works very well for lots of games

Stable?

for most games yes. here is the official compatibility list: https://rpcs3.net/compatibility

Can you use Xbox controllers?

You can use any controller you can get working on your pc. Xbox controllers work fine.

Is it especially strenuous on the system?

depends on what you mean with especailly. just like other emulators it needs a strong cpu. it should support the avx2 instruction set. here are the official requirements: https://rpcs3.net/quickstart> Nigger

I kinda wanna know what turbocum said to get banned

It seems he is only banned on your instance. i see his comment. It was the n-word (with out any other text).