One of my friends had a hired hard case - not sure of the make though.
Hers was infinitely easier to move about and quite a bit smaller.
She booked hers on as an extra case an paid a modest fee on line in advance I think.
My EVOC was bulky and difficult to manoevre.
I felt I had to pad the bike up with all of my cycling gear - it wouldn't have seemed secure without....and so it effectievly doubled as my suitcase - as everything I needed for a week fitted around the bike with loads of room to spare.
This however took it over 23kg - I think it was about 28kg - can't remember.
Because I couldn't pay up front for the excess weight I ended up paying a large number of euros (69) on the way home to travel with it. Fortunately they turned a blind eye on the way out.
The baggae handlers showed no care at all in throwing the EVOC about - there was no other way to move it really.
All our bikes survived unscathed.
If I could choose again I would definitely choose a hard case. It seemed a lot more secure, easy to manoevre, easier to pay for beforehand, and I'd take a separate case for my other gear - and not have to put everything in plastic bags to keep the bike oil off.