love mine...dont' have problems with tension but I use the same brand of thread all the time (weight and type)
My table isn't heavy -- and i luckily found a local technician who services all brands (mine is out of warranty)
i wouldn't trade and it has helped save the life of my domestic since I had been doing FMQ on it (there was NO learning curve since it was still moving the fabric rather than the machine)
i would buy it again tomorrow.