I don’t know what you plan on replacing, but the primo is plenty capable IF you pay attention during your plan, build and setup, and aren’t trying to do ‘too big’ pieces. My experience stops at about 6x6, but I know that’s not the upper limit.
The makita is capable of lower rpms right out is the box, 10k or so vs the dewalt 16k. Also sits closer to the core than even the 660 now (more rigid) if I understood Ryan correctly. I’m thinking about getting one even though I’m pretty happy with my 611, since most steel cutter manufacturers recommend rpms between 8k amd 14k for smaller tooling like 1/8.
On the other hand, other folks with desktop machines actually cutting steel subscribe to the “letter rip, tater chip” school. Moderate DOC (30-100 thou) light stepover (10-12%) and just go at it. I’ll try that method next.
Here’s a new one…