Genesis is acceptable, easy to use, but a bit buggy.
In which way buggy? I haven't noticed in over tens years of use in four different systems and numerous network cards (from 030 to PPC, from 3.1 to MorphOS 1.4, zorro/pci/pcmcia).
The only drawback of Miami Deluxe is that it needs a beefy system to operate correctly, if not, you will get slower conections than both Genesis and AmiTCP.
Beefy doesn't help, it's always slower.