Hi dangit69,
I’m not dangit69 of course and hopefully they will see your post and have the chance to reply but I can help with these types of questions. The most important factor in the durability and useful life of a mattress is the quality of the materials inside it (see post #4 here). There is also more about the many variables that can affect durability and the useful life of a mattress relative to each person in post #4 here and the posts it links to.
The comfort and support of a mattress or what I call PPP (Posture and alignment, Pressure relief, and Personal preferences) will also vary from person to person depending on their body type, sleeping positions, and individual sensitivities. A mattress that is perfectly comfortable and perfectly supportive for one person may be completely unsuitable and very uncomfortable for someone else to sleep on.
The best way to know whether a mattress is a good “match” for you in terms of PPP would be your own personal testing of experience on the mattress. When you can’t test a mattress in person then the best way to decide whether a mattress may be a good match for you would be a more detailed conversation with the manufacturer (see mattress firmness/comfort levels in post #2 here). In the case of the Christeli Versailles, the description indicates that it’s comparable to the Tempurpedic Contour Select which is widely available so it may also be a good idea to test a Contour Select in a store to see how well it matches your specific needs and preferences in terms of PPP which will give you an idea of how the Versailles will feel and perform for you.
It can be very risky to choose a mattress bases on someone else’s experience which may be very different from your own.
Phoenix