I tried the Easy Quilter at a quilt show and loved it:
http://www.easyquilter.com/eq1.htm
Although sit-down, with the Easy Quilter you are moving the machine rather than the quilt. The one at the show was with a Janome 1600P (fast stitches per minute) that has a larger harp than conventional domestic machines and therefore can take the slightly larger table. The setup was very compact, yet very easy to use. I sat down at it, the seller said to simply floor the pedal, and it was amazingly easy to make loops, leaves, flowers, etc. right away!
For this system it's easy to spray baste your quilts (which I do anyway). For large quilts, you separate the batting into sections.
I'd probably get the Easy Quilter setup over the Sweet 16 mainly because it allows moving the machine instead of the quilt. Cost of everything new would be about $1500 for the Janome 1600P and $700 for the table-top frame.