This was asked a while ago but I cannot find the original post.
At the time of the post I had only just received my new machine, a 4 head Tajima. This now runs along side my Barudan machines.
I think the post was asking how easy it was to run the two makes together. Well, after a few months with these two makes I can say it not difficult at all. Both machines need different input, the Barudan uses .U?? and the Tajima .dst. Non of my machines are connected to the computer by cable as they are too far from the computer. All datai is transfered by USB and I have a USB for each make of machine.
The only annoyance is that when I need a job doing and the other machine is free, I have to go back to the computer and convert the datai.
The Bobbins and bobbin cases will fit both makes and when I need to renew the bobbin driver/holder ( sorry I dont know the proper name for this) I can order from either supplier as they are the same.
My conclusion ; dont worry, running different makes side by side is not a problem.