I just got my Deep Navy Solo Loop, and it's fantastic! I typed with it for a few hours and it felt less noticeable than the Sport Band.
I was in between sizes with the measuring tool, even when I tried to tighten it a bit, and I went with 7 instead of 8. My sizing approach seems to have worked. I'm able to easily put it on and off, but it stays in place when I shake my arm. I was wondering if I should still try the size 6, but probably not since I'm already seeing an indentation after a few hours of wearing it. I'm surprised by the indentation because it did not feel too tight at all.