Hi,
I use an iMach P1A from VistaCNC, initially with Mach3 and when the new Mach4 plugin became available I've used it in my Mach4 installation.
Only ever had any bother with it, I thought I had fried it, my fault, 130Vac leakage current back through the pendant to ground.....ouch! Was happy to send
it to them for repair but they believed it was a software corruption fault rather than hardware, they supplied fresh firmware and I was back in business.
I was absolutely delighted with their after sales service.
Whatever premium I paid to get a US made device has proved its worth.
Craig