I have a 28" Gammill (older model) and find that I love the bigger space when doing side borders and some types of FMQ--when I am doing custom work on a specific block (and I typically have 12" blocks) I will usually role the quilt top so that I'm able to sit on my drafting stool and work toward the front to get better control (espcially when I'm doing micro fill and using those handles) so I think you will be ok with what you plan--you may end up rolling the quilt to get the borders on side done but that works fine. I think you'll find that you won't have any more stops/starts on the long arm than you do with the sit-down--it all depends on the type of quilting you are doing on a particular quilt--for instance, it you do continuous curves you would just leave the needle down and roll the quilt and start up again.