I have the Baby Lock version (Coronet) and have now done 6 quilts on it; the largest is 80 x 80. Certainly I like it best when the quilt doesn't have to be moved from one side to the other. However, I don't have room for a larger frame. My feeling when I purchased and still is that I prefer moving the machine to moving the fabric, so this was a good choice for me.
Pros: moving the machine, not the fabric; fits in the space I had available
Cons: I still have to pin-baste; I don't have a programmable pattern availability
I just received the ruler base as a gift, but have yet to try it out or to purchase rulers.
Hope this helps. If you have more specific questions, please post them!