You should get one, Toogie! I also have a sit down longarm... the Juki TL2200s. It's the same machine as used in a stand up frame, just set in a table. Juki offers the same machine both ways. It has no robotics or stitch regulator, but I'm doing just fine without them.
I tried out stand up and sit down models, and greatly prefer the sit down. I think because I previously did my FMQ on a smaller Juki, so I had virtually no learning curve switching to the bigger machine. I like the visibility of my face being closer to the stitching as it is happening, and also feel I can control the movement much better by moving the quilt, rather than the whole machine on a trolley. Something about the weight of the machine/trolley just throws me off.
Try out some models to see which style 'clicks' for you. If you go to a quilt show, there are usually many types to play on.