I have used IT luggage "lightest max cabin size" rollers for several years now, with good experiences. I usually travel with carryon-only bag whenever possible.

When I got tired ot carrying everything on my shoulder I went from the Air Boss (great shoulder bag) to IT luggage (previously called sub-0-G, google and search FT for reviews with that name also) roller bags because they are the same weight (from 1.5kg for 21") but with wheels.

I think these are OK as carryon but not strong enough to be checked in, with their "frame sticks with soft sides" construction. I worry a bit about forced or gate check-in sometimes.

In many areas of the world carryon weight limits are often very small (8 kg, or even only 5-6 kg) and can be strictly enforced, so the lightest (by weight) bag is really key to doing one-bag travel around the world.

Sometimes I use a piece of rigid but lightweight "advertising board" inside the bottom of the soft sided bag, to keep the soft bottom from bulging too much.

I'm now on my second bag from them, the "21" laptop trolley" which has a padded compartment for my laptop (quick to take it out at security or otherwise) and more pockets than the previous models.

I'm still somewhat amazed that you can have a good roller bag that weighs only 1.5-1.8kg (about 3-4 lbs).