Not big enough for large cats!
I have a 3Kg Burmese who won't touch it, probably as it is on the floor & a 6.5Kg Maine Coon (that is small for a coonie) who cannot fit more than 2/3 in - although he does give it a good go. They occasionally scratch it, but, mostly chew big lumps off it - it keeps their teeth clean I suppose! This seems to be constantly on sale too, so, don't be fooled by thinking this is a bargain.