I have the Juki TL98QE and use it for machine quilting. I can use any thread I want. I haven't had it mess up because of thread type. I use a 70/10 needle most of the time. I bought mine used from a dealer and it was serviced and checked. So far I haven't had any tension issues but the foot pedal sticks once in a while in slow speed, no big deal right now. Juki's are fantastic machines. There is a Facebook group for Juki machines and lots of great info there.