Send a cut, get frame-accurate notes, drawings and approval. No more "at around 0:40, the bit with the guy". Paid once, never monthly.
4K is fine. Clipnod makes a smooth review copy in the background.
Notes on exact frames or in–out ranges, drawings on the picture, one-click approve.
Drop v2 on top of v1. Every version keeps its own notes. Export notes as Premiere markers.