Retrofits for Dyna Mechtronics

I recently bought three DM 2800 mills, and I'd like to retrofit the
machines for PC control instead of learning how to use the somewhat
obscure Dyna controller. So far, the only "plug and play" retrofit
kit I've found is by Ah-ha!. Does anyone know of other retrofits
available? Can anyone give first hand accounts of experiences with
Ah-ha!, either good or bad?

TIA,

Patrick