Brother might be an exception, but overall i completely agree with MKD, i'd never buy a doosan with HH or siemens control, buying a Grob with HH is sketch af too IMO.Neither of these things is true in this case.
A CNC mill control needs to be exported from Japan either as Full 5 or not, and both Japanese METI laws and the US/Japan trade agreement specify that a control cannot leave Japan as a 4 axis, then be upgraded to full 5 after export. As such, Brother has the standard D00 control on most machines, and offers the D00v for the full 5 axis mills - they are identical controls with the only difference being a firmware lock to keep a D00 from ever getting upgraded to a D00v.
D00 was designed from the ground up for full 5 axis - Brother had the older C00 control doing full 5 axis stuff for a few years, but their own assessment was that it didn't have the processing chops or encoder resolution. I know these were internal to Brother, but they never sold them, even in the Japanese market. The first "full 5" Brother is the M200 Xd1 5Ax.
My region has more U500s and M200 5Ax Speedios than anywhere in the country. These machines are performing *far* better than I ever pitched they would to users. Work that was running on *much* higher spec machines is moving on to these; surface finishes are comparable, accuracy is comparable - but cycle times are Speedio shorter and they cost 1/2 what anything else does.
Would I make a Speedio 5 axis my *only* machine though? I'm guessing for about 25% of the market, I would be able to say that is a good idea. It depends entirely on the goals and the parts you need to make - if everything fits in your hand and you are more volume oriented, or doing captive R&D work internal to a company? Absolutely! If you hung up your shingle as a job shop and need massive flexibility in both parts mix, materials, and a bigger envelope for larger parts? Probably not.
Where I am happy, is walking into any 5 axis shop with Hermles, Yasdas, Makinos, Grobs etc etc, and telling them instead of buying more $500k mills, they can buy a U500 5Ax for around $200k to free up their more expensive spindles, without having to change the process or give up much of anything.
brother is different because they make their own control, not just implementing someone else's stuff into their machine, but you already know that just clarifying