Hi juhasznebakos,
Welcome to the Mattress Forum! 
While this site is not a review site, Intellibed has been discussed on the forum and you can see some of my comments about the Intellibed (and other types of buckling column gel) in this topic and in this topic a forum search on Intelligel or on Intellibed (you can just click the links) will bring up more comments and feedback about them as well. A forum search on buckling column gel (you can just click this as well) will also bring up more comments and feedback about other types of buckling column gel as well. Buckling column gel itself is certainly a somewhat unique material and is also very durable. It’s one of those materials (much like memory foam) that tend to generate strong feelings either for or against it depending on preferences but for those who like how it feels and performs it can certainly make a good choice.
I hope your research on the site has included following the guidelines in the mattress shopping tutorial as well.
Phoenix