doublevr
I would guess that the Melody should make less noise than the Handy2P because it is belt driven. Maybe Melody can do slower speeds under 20mm/s a bit smoother than the H2P with lighter weights... With the H2P it can feel like it is vibrating unless you are using a heavier sleeve like a Fleshlight at slow speeds under 20mm/s.
I would also guess that the Melody will do around 1-600mm/s? Maybe even a bit faster without having to overclock the device. I can't see any other differences on a single axis stroker except for the software.
I was really hyped for the Melody but too much delays and no information made me get the H2P but it will be fun to see what you guys have been working on.