I picked the Hatmann Ratio global (the black one) for my 2MM about a month ago - it's like you describe, it has a small garment insert that works for 3-4 shirts. The bag is nice - quality construction and it glides well. I've been able to jam 6 days of clothes in it. But I'd hardly call it expandable - it has an expandable zipper, which doesn't seem to make much of a difference. FWIW the other Hartmann (hard sided) and Tumi carry-ons weren't available when I made my selection.
thanks That’s what I ordered. Sucks it’s not expandable but most of my trips re four day so should work for me