If you love to travel with big suitcases, lots of shoes or clothing choices and extra space, it's hard to be convinced otherwise. Having said that, I thought I'd pile on with my recent experience. My friend and I took two heavy 24-in spinner bags for a 3 week trip including Sorrento/Amalfi coast, Venice, Cinque Terre and Rome. This was my bag of choice even AFTER getting seduced at the RS store and buying a set of his super light bags. I like my creature comforts, certain products and clothing options.
What a nightmare! We splurged on private transfers and black cars many times. But the utter hassle of cobblestones, narrow streets, many trains, bridges and stairs convinced me to embrace minimalism next time.
Even hotel elevators aren't a given. We stayed at Marriott's Boscola Excedra in Rome and parts of the hotel require ascending five or six stairs with said giant heavy bag in tow. Yes we could've given our bags to a bellman but who wants to be totally dependent on others to move about? Just for the option of having my distressed leather Franco Suarto booties and crushable down jacket - both of which I used as the weather went from 80 to 50 - but could've lived without along with 9 other shoe choices? Maybe not.
I'm not any good with advice on how to pack lighter but many others on this forum are. The whole "rinse out in your hotel room sink" only works if your clothes dry before you leave town. Not a given in humid Italy! But I'm going to learn for next trip.
I will say that I used the RS roller carryon when vacating a temporary apartment in Seattle and that bad boy stretches to hold an amazing amount of stuff! I think with some judicious pruning I could've made it work.
And I think the feeling of freedom from towing a heavy bag around would've been worth it's weight in Michael Kors coated cotton houndstooth flats - in three colors!