The only thing I don't like about my Juki2010Q is the way you have to get into the bobbin area to clean it. It takes unscrewing screws! They can fall and be lost, or get stripped out for how often you need to clean a bobbin area. To me, this is poor design.
My old Bernina 830 record had the needleplate just pop off when you press a switch, so I wasn't used to so much effort to get in and clean the feed dog area... especially on a late model machine. If you don't keep the lint out of there, the Juki sews with bad tension.
Never have been able to work the auto threader, either, but I don't really need to. I can thread a needle.