Everyone has their own views, and I used to do a pet sitting service. The cats are fine left at home, but I have to say I would rather know mine were secure in a cattery so they could not get out or if they were ill I know the owners would get vet treatment for them. They sleep most of the time anyway, and are fed and cleaned regularly and often played with by the staff who do the job because they love cats. It really depends how dependable the people are you leave to care for them. Can you trust them to go in every day and would they know if anything was wrong, if you have any doubts perhaps a cattery would be better but if you know you can rely on them then give it a go. Very few cats actually 'pine' their noses might be out of joint for a while, but they are anyway when you go on holiday. We had one that would get in the suitcase while we were packing, and as others have said, you will be well and truly ignored when you come back, whether or not they have been left at home or put in a cattery.