I finally got to play with the Jazz 2 a little today. It is truly a learning experience, especially the threading of the machine part. The diagram they show is so small that I missed two points and how the thread spool is inserted. I first did it like my Singer. Found out this machine requires the thread to come over the top, instead from under the spool.
I didn't understand one of the diagrams of the upper part of the machine. I discovered I needed to put the thread under a small metal plate that compresses the thread down. And the other thread point of contact was just above the needle. I just didn't see that little part.
The results of my missing things was that the thread stitch started out just fine for about an inch, then progressed to bunching up terribly. I tried adjusting the tension and that didn't do a thing. That told me I was not threading the machine properly, and I discovered my errors after getting out a magnifying glass to view the diagram a bit more closely.
I sewed through one of my quilt blocks that I had already practised on. The thread seems to be doing fine on both top and bottom, but I probably won't know until I do a lot more sewing. Once I see an anomaly, then I can make small adjustments in the tension.
I like the knee presser foot lifter. I do miss the automatic thread cutter, as having to move the fabric out enough to snip things wastes a lot of thread. I'm happy they put an up/down needle button on the machine. And also happy they put a button that tells the machine to finish a stitch in the down position.
I probably will need a few days to get used to the machine. Unfortunately the table I have that my Singer machine likes, isn't sturdy enough for the Jazz 2. Don't know why. Guess the extra 10 pounds might be the difference. So I will have to build a setup that will allow me to have the needle pointing towards me, so I have the quilt projecting out both sides. I still plan on having the quilt sandwich rolled twice to make handling things easier. It worked well for my Singer, and I believe it will be even easier with the extra space the Jazz 2 provides.