Thought I would pass this along for those who are trying to make future decisions with regards to mach4 compatibility.? I inquired whether they had a Mach4 plugin for their UC100 and if not when they might develop one.? Here is their response:

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Thank you for your e-mail and for your interest in our products.

I'm afraid we will not write a Mach4 plugin any soon and we have the following reasons:

1.) Mach4 is still in too active development which means the SDK interface is changing a lot as the developers fixing bugs and changing things, this means that we should always follow these changes closely and that the changes could break the plugin. We are not really interested to go into a jog like this now which could take forever and would give us an infinate job. We will write a plugin only if and when Mach4 will become stable enough and when the development will be not this active anymore.

2.) We already have our own software called the UCCNC. The software can already do most of the things mach3 and mach4 can do and we already working on advanced things which mach3 and also mach4 can't do,
so probably at the time when mach4 will become stabile enough we will probably will be ahead of mach4 with our own software development, so there will be then no real point for us to write a plugin for Mach4 ... but ofcourse this is just an idea, time will decide. :)