Any experience of Novusun Ethernet motion controllers?

I'm tempted to address some noise issues I'm experiencing (random e-Stops, and the like) with a bit of a re-jig of the mill set-up (mill is Mach-3 adapted Denford Starmill) - new support table, and integrated control system. As part of this I'm looking at the cheaper end of the motion controllers, and that old stalwart of CNC supplies, eBay, offers a 3-axis Novusun, "NVEM V1.1" at an affordable price-point.

My question is: has anyone here had experience (either good or bad) of this breed of motion controllers?