I tend to associate the Amiga with razor-sharp interlaced displays, so seeing 640x400 noninterlaced in an emulator leaves something missing. The Amiga also had an unusually smooth mouse response due to its interrupt prioritization and use of hardware sprites for the mouse cursor. I had never seen a mouse move as buttery-smooth as it did on the Amiga. Again, this is not captured via emulation; not even my MiSTer seems to get it right.