Going to agree wirh everyone else, the drop down feature is a game changer when it comes to large quilts and I'll use a recent experience as an example.
I was quilting two small projects, one that was 11 x 22 in and another that was 14 x 50 in. I was using my machine that waa sitting on my cabinet and no matter how many times I adjusted myself and my chair, I was scrunched up. I kept tensing my shoulders and my arms, I had to fight both projects in and out of position and I paid a heavy price for it for a couple of days. On top of that, the quality of my quilting suffered, it was downright hideous and I'm glad they were for me and not for someone else. I'll have to remake them again at some point just because I can't stand the look of them, but they are serving a purpose right now.
I have since learned my lesson and will be using my other machine that is dropped down in my cabinet for my quilting. Your posture will be better, which means you'll be able to concentrate on your quilting and if you're comfortable, your stitching will benefit greatly. Having the right angle of sight makes all the difference in the world.