Can we stressful. Just returned from a three week trip Sea > Lisbon, LIS > Toulouse, Toulouse > Sea (with layovers in Paris and London on way home) and wanted to share experience using a BUDS RMTBAG Pro that was purchased a few weeks before the trip to replace a 20+ year old hard case.
When it was all said and done, my bike (a Lauf Seigla gravel bike) traveled there and back in one piece. So, the case did it's job :)
The RMTBAG Pro is big. This is the one where you can leave the rear wheel on. Having used an old case where both wheels need to come off, I can say being able to leave the rear wheel on makes packing a breeze, really. The tradeoff is you're dragging around a large case (which means you need a decent size car to carry it in). There's a pocket for the front wheel, take off the handlebars & pedals it literally fits right in. (Worth noting this case is big enough for a MTB so there was plenty of space for a L gravel bike.)
I did take the rear der off too. While there certainly is some padding on these cases, it's still a soft case and doesn't offer nearly as much padding as a hard case. As a result, I threw an extra 3in foam pad as extra protection. There's no question I will do this every time if flying. (Speaking of hard cases ... because this isn't one, the airline will make you sign a waiver stating such - basically they are not responsible if the bike gets crushed.)
As for longevity of the case, we'll see. Quality seems decent. There are some marks from this single trip but to be fair, it went thru a lot of hands/planes/cars. The wheels rolled well. For now, can certainly recommend.