I finally got the time to write back... I put:
Thanks for the message but I am afraid I am (along with a lot of other people) concerned with this item and that's not going to change. I am also wondering how a cat would groom themselves, eat, drink, curl up, get through cat flap easily etc... I just think that it hinders the cats natural behaviour. With a muzzle for a dog, it would only be on the dog for a short time each time it was put on and would in fact be cruel if it was on the dog for long periods which is why they are designed to be for short term use only.
I've looked at the website and to be honest, all I can see is cats who look uncomfortable. As someone who works in cat rescue, I see a lot of injuries and stressed cats (who then develop behavioural and health problems due to the stress) caused by new initiatives like this. The fact is a cat needs to be able to exhibit ALL of it's natural behaviours. Within my role I regularly see cats suffering from appalling injuries to their front paws and underneath their front legs - and even to their lower jaw - as a result of getting trapped by a collar. Worse still, treatment for collar injuries can involve repeated surgery which is very traumatic for a cat. Safety collars of course are available and should be the 'snap open' type but they do not always live up to their name. Whilst I can appreciate that some owners feel the need to put a collar on their cat for identification purposes (although microchips are common place now) this is definitely not an addition to the collar that I can support and I would have serious reservations about rehoming a cat with anyone who told me they were going to use one of these devices.
I'm not here to tell you that you personally are wrong, I am just giving you my informed opinion as I was concerned that others are being convinced that this is a good idea.
I'm sure it probably won't do much good but at least it make her think. It really has been one of those days... Had so many people on the phone with really sad reasons as to why they want their cat rehomed.