I don't know how many of the DC series of chippers are out there at this time, but I can find out tomorrow. Dynamic builds about 200 machines a year, they are a small company, just a few years old, but the engineers and management have decades of experience in the chipper industry.
BTW, I did run my DC50 chipping coconut fronds and other coconut debris. Chipped it up no problem and discharged it very well. The chips were not as fine as my old Gravely 395, but no chipper I came across ever chipped as fine as that machine. It did chip it about 50% finer than my Woodsman 18X, but the 18X is about 2.5 times as fast. Of course, it is NOT a fair comparison, since the 18X is an 18" machine and I have modified the feed roller on it to run twice as fast as factory. I have been running it this way for about 6 months now....runs about 160 fpm. My 18X easily outchips my friend's 18X and he has the same 200 hp Cummins, but the unmodified feed roller speed. The DC50 runs at 100 fpm and mine has the 115 hp Perkins.