I have the LGII and the Juki 98Q. I've only done one baby quilt on it so far, but really liked doing it. I got it last fall for my birthday/Christmas. I had been just practicing and then got brave and tried the quilt. It was fun. I do have the Sure Stitch Regulator and the upgraded carriage, and I heartily recommend both. I tried it with the wooden carriage and couldn't make good circles or curves because even though it was put together tightly, it had a bit of wobble. The upgraded carriage is metal and made such a difference I couldn't believe it.
I haven't tried a larger quilt but I will be. I know I'll most lightly have to turn it to finish it, as it will be either a queen or full and rolling the whole thing up to finish would leave such a small area. I turned the baby quilt 1/4 turn to do the borders/sashing and it wasn't near as hard as I thought it would be. And the machine stitches wonderfully!