I work mostly with Allen Bradley VFD's at work and they are solid, but a little expensive. We also have lots of Modicon equipment (Schneider Electric), and I work with Modbus a lot, so I decided to go with Altivar 12 drives from Schneider Electric. It took me a while to figure out how to write to them, but now I have it figured out, they seem to work really nice. I'm now starting to get into the Macro pump and brains programmig to integrate them into Mach 3.
TeaMan