Worth every penny for multi-cat households!
We got two of these after recently adopting a 2nd cat, and realising they were dipping into each other's food.
Our piggy tabby is a whopping 7.8kg (prob not helped by stealing the new cat's food for 2 months), so needs to go on a diet.
The feeders are not particularly noisy, with a gentle action, so we went from training 1 to normal use in 24hrs, they both got the hang of it straight away.
They're great! Pricey but worth it not to end up with one fat diabetic cat, and one under-nourished!