vids of open phones leaking sound?

to the amp question - no you don't need an amp with the sr60, 80, or ms-1

to the leak question - they leak quite a lot, the same as any open-backed headphone. I would probably say that for library listening, Grados are not ideal, because even on a low volume setting sound leaks out and can be heard from a considerable distance away. For home listening the leakage is not an issue, but for a quite environment I would say the leakage is too much.

It'll depend on how loud you listen to your music honestly.  At times I've listened low enough to where I could hold the headphone out at arm's length and barely hear anything.  Other times I could crank the music up loud enough to be able to hear from other rooms.