Well, I am a new user of a Juki 2000... and have a computerized Brother. From other peoples comments, Lots of oil for the Juki. Oil after every use even. Also, patience with the tension seems to be what I have had to concentrate on the most.
I would say, The Juki 2000/2010 is great for FMQ, heavy duty sewing (sewing thru thick layers) and really even straight piecing. The smaller computerized machines are great for fancy stitching and also for piecing. And buttons and zippers, etc...