I just finished one using McK designs...the ones of her underwater creatiions. It was on a king size quilt that I designed and made a panel with 6 of her blocks.
As far as quilting them..........I had no problem. They were pretty densely quilted....bubbles , pebbles, water, echoing, etc. I used Floriani Thread with Bottom Line in the bobbin and some King Tut, size 4 needle. Most of what I make is done with fusible and and I do alot of stitching. These machines do a fabulous job on the fusibles. Do try,as Linda said,not to rip out stitches. but if you have to just use a little, damp foam paint brush and gently rub out the little holes
Have fun with your quilt.