I've have a little expriance with it, I consider it junk.
We have worked extensively with both the brand and the company, and in my opinion, that 'junk' comment is a bit too harsh. The NS machines can be a little squirrelly, but I believe once an operator is familiar with their peculiarities, they can be effectively managed. Ryan who manages their service operations in Ferndale, WA is top notch; one of the best in the business.
The bigger challenge is determining which machine is best suited to your unique situation, including but not limited to the style of machine for your business type, use volumes and availability of local service. All too often, people have a bad experience with a machine or brand, then instantly blame the name plate without ever stopping to think if it was the right style or type for their application in the first place.
In some situations the NS Master may be the perfect solution, and a totally dreadful one in others. ...kind of like my Alfa Romeo, it's the perfect car for tooling around town on a Sunday afternoon, but I'll take something else for the long trip cross country. You can ask "is an Alfa Romeo Spider good?" but the question really should be "is it the right car for me?"
So, what do you plan to do with this Master?