I have an HQ Sweet Sixteen which I understand is the same machine. I love mine. It is so easy to use. Getting the bottom tension right is sometimes a challenge.
I, too, do not have the space for a long arm with frame. This 16 fits nicely in a corner of an extra bedroom. If you have the space, I would recommend that you purchase at least 1 leaf to add more space to the table. I did not. Instead, I use a card table and another small table, neither of which are at the same height as the 16's table. The difference in height some times causes the quilt to catch and drag. However, I have done a large full-size quilt on it as well as smaller ones. The smaller ones are a breeze to do. The large one required more manipulation.