Cats are on the fence over the caves
My younger 3 cats at first seemed to really like the 2 that I purchased for about 3 days. Then they became uninterested in them. The 2 older cats (13 & 14 y.o.) sniff the caves every now and then, but don't utilize the caves at all. I haven't given up hope yet on the caves. I have 5 very finicky felines. The youngest cat (1.5 y.o.) does lay on top of them occasionally. I think the product is great myself. Time will tell for the felines.