I can never reliably cut/copy and paste what I want in Vim. I'm always either picking up or leaving behind stray characters at the edges of my visual selection, because I find the end cursor so counterintuitive.
Especially true when newlines are involved, it's always a mystery how many newlines I'll paste into my document when I hit p
to put.
This is not Vim's fault, it's just skill issue.
Oh, and it's also a mystery whether the system clipboard will work properly with Vim out of the box or not. There's some voodoo setting you have to tweak if it doesn't.