The X550 looks pretty good and got a good review from Peter Vaughn, chief reporter of MMM.
Before you go for one, check how far down the bed comes - can you get in and out without a ladder? and do you sleep lengthways or sideways, each of which might have difficulties.
I just looked at the photos on the Chausson web site. Is the wash basin in the washroom one without a drain plug? If it's one of those which dump water from the tap straight down the drain then for me that is an instant refusal. You have a limited amount of water on board and the last thing you want is to dump it all straight down the drain when you turn on a tap. They are hideous abominations and the designers are without excuse for incorporating them.
We had a Chausson some years ago and ours was fine.
We had a new Rapido a few years ago and the electric bed saw it sent back to Brownhills three times to get the bed to work reliably. Either they couldn't fix it because they were incompetent or the workshop manager didn't give the technician enough time to find the fault but in the end it was left to me to get the bed's installation and operation manual from the manufacturer in Italy (Project 2000) and fix the electrical fault myself. The uncaring assembler in the Rapido factory coultn't be bothered to push an 8 pin plug and socket together properly. So much for they quality control - it's non existent. Then the bed collapsed in one corner - luckily I wasn't driving at the time. So that was the end of my enthusiasm for electric beds and I wouldn't have another one.