I too long considered the BR 20' models. The outside handle system is such a waste of precious space that I simply couldn't bring myself to do it. The lost space could have been used for all of my socks and underwear plus toiletries (if packed tight and compacted).
As for expandability that is a non-starter for me. If I expand a bag that means I have to check it - no way Jose. Why bother carrying around the extra weight of an expander when I can't possibly use it...
I am still with a Vitx Werks 2.0 20', bought a second one on eBay last week as backup since they don't make that bag any longer. I haven't been able to find a wheeled 20' bag that surpasses it in sheer volume.