per curiosita' l'ho comperata ma leggendo i messaggi della loro lista ho trovato che, da un punto di vista di latenze, la combinazione PC+schede (tipo MESA) sembra essere ancora vicente.
A puro scopo di documentazione riporto di seguito il messaggio originale tratto da qui
x86 systems are still _generally_ better than the BeagleBone for
latency, and provide dramatically better performance (particularly the
3D GUI user interface). The 'Bone has the built-in PRUs which helps it
beat x86 software stepping performance, but if you have external
hardware for the x86 system that will work even better.
Also, there are no BBB drivers for any "smart" motion add-on boards
(from Pico, Mesa, or anywhere else) that I'm aware of, other than the
on-board PRUs. Jon of Pico systems has played with the BBB and replaced
some aging x86 DMA hardware with a BeagleBone, but this was for his
photo plotter, I don't think he's got the stepper controller working
with the 'Bone yet. Mesa was going to send me a low-end FPGA board I
was going to hook to the 'Bone with SPI, but the never did, and I've
been busy enough with other projects I haven't pestered them about it.
The big benefit to using the BeagleBone vs. a PC is generally size,
cost, and (maybe) cooling. For a small desktop 3D printer, even a uATX
atom motherboard is pretty big and it's helpful to have something as
small as the 'Bone to control things. For real machine tools, a
well-chosen x86 box is almost certainly the way to go.