Wow. You really must know how to pack and travel light. I travel rather heavy now. Thanks for telling me about your travel experience!
I was recently forced to pack for a two week trip with only a carry on. I took the RIMOWA since it was lighter than the FPM as I would be flying airlines like TAP and Lufthansa where I would be subject to a 7-8 KG limit. My case weighed 9.5 KG, but the lady at the Lufthansa desk told me to try to keep it as close to 8 KG as possible. I have a feeling that with the FPM, I'd probably be at 10.5KG and I'd probably be asked to check the bag. Thus, the FPM really doesn't get used the same extent as the RIMOWA. Maybe for USA Airline-only trips as USA airlines never weigh your carry on.
My FPM has never been checked. And my Rimowa has been checked maybe 2-5 times? I don't remember. But each time I cringe and worry if it will be dented. I have a perfectly tight fitting cotton laundry bag that I cover the Rimowa with once it gets checked and so far it's survived without major scratches. My biggest damage came from a porter dropping the Rimowa on the cobbled driveway at a hotel in Los Angeles. That ruined the rest of my day!